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This page highlights products that have been entered into the CMS.
The product will be live on the website on the date noted below the title of the product. While clicking on the title of a product that has not yet been released will result in an error message, the URL of the page that contains the error message will be the URL for the product once it goes live.
Periodically--about once per week--the list will be updated to eliminate products that have been released onto the website and highlighted in the E-Newsletter.
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This page is for internal TRB use only. It may not be shared with anyone outside of TRB.
Developing a Holistic Airport Common Use ProgramFebruary 1, 2024 Common use programs at many airports have been limited to a few core information
technology systems and may have struggled to provide the needed level of customer
service to passengers, airlines, and other stakeholders.
ACRP WebResource 17: Developing a Holistic Airport Common Use Program,
from TRB's Airport Cooperative Research Program,
provides guidance on how airport operators can expand the scope of common use
beyond the traditional IT systems and incorporate new systems and processes to gain
more operational flexibility to meet the needs of the passengers and airlines.
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Compilation of DOT and FAA Airport Legal Determinations and Opinion Letters as of December 31, 2022February 1, 2024 U.S. airports that receive assistance from the federal government are required to comply with a
number of obligations imposed by federal law.
The TRB Airport Cooperative Research Program's ACRP Legal Research Digest 21: Compilation of DOT
and FAA Airport Legal Determinations and Opinion Letters as of December 31, 2022 covers legal
matters that include the reasonableness of contractual terms, leasing practices, airport rules
and regulations, airport charges imposed on aeronautical users, including airlines, and the standards
for determining airport sponsor compliance with other federal obligations. Some of these documents
discuss procedural matters applicable to particular agency proceedings.
This updated compilation contains agency determinations covering administrative cases brought against
large and small airports throughout the United States, as well as DOT and FAA opinion letters, memoranda,
and related documents.
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Acceleration, Deceleration, and Stopping Sight Distance Criteria for Geometric Design of Highways and StreetsFebruary 2, 2024 Acceleration, deceleration, and stopping sight distance (SSD) criteria are necessary considerations
for determining geometric design requirements of roadways. Acceleration and deceleration are
influenced by many factors, including grade, vehicle type, and maneuver type. Stopping sight distance is influenced by factors such as brake reaction time, object height, and driver’s eye height.
NCHRP Research Report 1081: Acceleration, Deceleration, and Stopping Sight Distance Criteria for
Geometric Design of Highways and Streets,
from TRB's National Cooperative Highway Research Program, presents enhanced guidance on acceleration and deceleration and SSD criteria for the geometric design of highways and streets that may be appropriate for consideration in future updates of the 2018 AASHTO Green Book criteria.
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Traffic Safety Culture Research RoadmapFebruary 5, 2024 As states and localities adopt a vision of zero traffic fatalities, greater attention is being
given to communication, collaboration, leveraging resources, and applying a systemic
approach to traffic safety which requires a change in culture among road users and traffic safety
agencies. This change in culture is tied to education, engineering, enforcement, and emergency
services.
NCHRP Research Report 1091: Traffic Safety Culture Research Roadmap,
from TRB's National Cooperative Highway Research Program,
presents a research roadmap for promoting traffic safety
culture among state departments of transportation and other transportation
safety agencies.
Supplemental to the report are
NCHRP Web-Only Document 382: Traffic Safety Culture: Conduct of Research Report,
a communication briefing, a process management briefing, and a research briefing.
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Traffic Safety Culture: Conduct of Research ReportFebruary 5, 2024 Traffic safety culture is a complex topic spanning a range of sociological and philosophical
concepts as they relate to transportation safety and the systemic framework that produces
different kinds of traffic safety-related outcomes.
NCHRP Web-Only Document 382: Traffic Safety Culture: Conduct of Research Report,
from TRB's National Cooperative Highway Research Program,
contributes to the body of research on traffic safety culture and is designed to help build a practical trajectory
for conducting research that will further grow the practice in the United States.
The document is supplemental to NCHRP Research Report 1091: Traffic Safety Culture Research Roadmap.
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Airport Energy Resiliency RoadmapFebruary 5, 2024 An airport’s energy service from the grid may be vulnerable to increasing demands and
costs and the potential for short- or long-term disruptions caused by natural and
human-caused events. Developing an airport energy resiliency roadmap allows the airport to
establish a baseline of its energy use, supply, and vulnerabilities; set goals and
related strategies in concert with stakeholder input to address its energy resiliency;
and prioritize and integrate the strategies into other airport planning processes, including funding plans.
ACRP Research Report 260: Airport Energy Resiliency Roadmap,
a pre-publication draft from TRB's Airport Cooperative Research Program,
provides the step-by-step process for airport staff and stakeholders to develop a customized
plan for their airport and to provide data to the airport’s decision-makers to generate
support for the implementation.
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TR News 347 September-December 2023: Transportation in Rural AmericaFebruary 5, 2024 The September-December 2023 issue of TR News—with a cover feature on Transportation in Rural America—is available online in full to both subscribers and non-subscribers.
Feature articles in the issue explore topics such as the availability of automated vehicles and
associated infrastructure, how research and workshops inform
transportation along low-volume roads, and how a vast
network of airports serves Alaska’s traveling public. This is Issue 347.
To subscribe to TR News and receive the full issues four months before everyone else, sign up through MyTRB.org. Subscription rates include postage. Subscribe based on if your mailing address is outside North America or in North America.
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Outsourcing Post-Construction Stormwater Best Management Practice Inspection and Maintenance ActivitiesFebruary 7, 2024 Post-construction stormwater best management practices (BMPs) are designed to reduce the
amount of stormwater runoff, prevent erosion, and improve water quality by removing
pollutants from stormwater.
NCHRP Synthesis 614: Outsourcing Post-Construction Stormwater Best Management Practice Inspection and
Maintenance Activities,
from TRB's National Cooperative Highway Research Program,
documents state department of transportation practices related to outsourcing
post-construction stormwater BMP inspection and maintenance compliance activities.
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TR News 348 January-March 2024: Improving Maritime Safety cover and table of contents now available onlineFebruary 7, 2024 The January-March 2024 issue of TR News is available online and in print in full to subscribers. The cover and table of contents is available online to non-subscribers.
Feature articles in the issue consider the human factor in maritime transportation safety, the intercity bus industry’s post-pandemic struggle to recover and its ramifications, and strategies for reducing roadside fire risks. Also included are interviews with the winners of TRB's Standing Committee on Native American Transportation Issues' "Call for Artwork." This is Issue 348.
To subscribe to TR News and receive the full issues four months before everyone else, sign up through MyTRB.org.
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Guide for Intersection Control EvaluationFebruary 8, 2024 Intersection control evaluation (ICE) is fundamentally a process that provides the framework,
steps, and tools and offers decision support for assessing trade-offs between different types of intersection forms
and controls.
NCHRP Research Report 1087: Guide for Intersection Control Evaluation,
from TRB's National Cooperative Highway Research Program,
defines intersection form as the physical layout of the intersection and intersection control
as the traffic control device used to govern movements for vehicles, pedestrians, and
bicyclists. For example, in the case of a modern roundabout, “form” refers to the circular
shape, while “control” refers to yield control at entry.
Supplemental to the report are
NCHRP Web-Only Document 377: Background and Development of a Guide for Intersection Control Evaluation
and nine Excel-based spreadsheet tools developed
in conjunction with the guide to help practitioners organize and document an ICE evaluation
and perform specific analyses: Intersection Control Evaluation (ICE) Process Tool, Capacity Analysis for Planning of Junctions (CAP-X) Tool, Planning and Preliminary Engineering Applications Guide Tool for Intersection Control Evaluation (PPEAG ICE Tool), Equity Assessment Tool, Design Flags Calculator Tool, SSI Score Calculator Tool—Intersection,
SSI Score Calculator Tool—Interchange, Safety Performance for Intersection Control Evaluation (SPICE), and Life-Cycle Cost Estimating Tool (LCCET).
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Background and Development of a Guide for Intersection Control EvaluationFebruary 8, 2024 A variety of intersection control evaluation processes and metrics are used by highway
agencies for evaluating intersection geometry and control options and identifying an
optimal geometric and control solution for an intersection. These processes usually address
safety, operational, multimodal, environmental, right-of-way, and cost impacts and other considerations.
NCHRP Web-Only Document 377: Background and Development of a Guide for Intersection Control Evaluation,
from TRB's National Cooperative Highway Research Program,
documents the initial development and evolution of the guidance for developing an ICE process
that is presented in NCHRP Research Report 1087: Intersection Control Evaluation: A Guide.
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The Future of Airport FinanceFebruary 8, 2024 As airport leaders look to the future, it is important to consider
how airports will fund their operations and investments and balance the risks in
providing services to their customers and users while maintaining sound balance sheets.
Transportation Insights 3: The Future of Airport Finance, from TRB's Airport Cooperative Research Program,
provides a summary of an in-person discussion forum convened by ACRP
for aviation leaders and stakeholders to identify new and emerging finance-related issues,
explore their relevance to airport authorities, posit new strategies for funding capital
and operating costs, and suggest ways the financial burden could be shared among the
variety of customers, users, business partners, and stakeholders of airports.
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Transportation for People with Disabilities and Older Adults During COVID-19: Lessons for Emergency ResponseFebruary 9, 2024 The COVID-19 pandemic left many persons with disabilities and older adults without
reliable transportation to access essential goods, medical care, and social engagements. Issues
of social isolation for older adults were exacerbated with the emergence of COVID-19
because transportation service was reduced.
TCRP Research Report 243:
Transportation for People with Disabilities and Older Adults During COVID-19: Lessons for Emergency Response, from TRB's Transit Cooperative Research Program,
aims to provide transportation organizations (including transit agencies, specialized
transportation providers, and other local government agencies and stakeholders) with helpful
information and strategies on providing service for persons with disabilities and older adults in
emergency situations.
Supplemental to the report is a pocket guide.
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User’s Guide for Quantifying the Effects of Vehicle Mix on Crash Frequency and Crash SeverityFebruary 13, 2024 Heavy vehicle traffic and vehicle mix have a substantial impact on crash frequency and
severity. The consideration of vehicle mix would improve predictive
methods for crash frequency and severity. Improved methods will result in better use of the limited
funds and resources available for improving the safety of the highway system and supporting
performance-based approaches.
NCHRP Web-Only Document 393: User’s Guide for Quantifying the Effects of Vehicle Mix
on Crash Frequency and Crash Severity,
from TRB's National Cooperative Highway Research Program,
develops and validates a statistically valid predictive methodology to quantify the effect of vehicle
mix on crash frequency and severity for various facility types, and
develops a spreadsheet tool for practitioners to quantify the effect of vehicle mix.
The report is supplemental to
NCHRP Research Report 1103: The Effect of Vehicle Mix on Crash Frequency and Crash Severity.
Supplemental to the document are three spreadsheet tools and 24 datasets across six facilities (note: tools downloaded before March 11, 2024 should be replaced with these current, updated ones).
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Open Platform to Attract, Organize, and Coordinate Volunteers for Rural and Small Urban TransitFebruary 15, 2024 One of the most critical challenges facing rural and small urban transit agencies in the United States
today is the scarcity of available funds. Although volunteers can help transit agencies reduce operational
costs, barriers such as difficulties attracting, retaining, and coordinating volunteers, inhibit the widespread
use of volunteers by transit agencies.
TRB's Transit IDEA Program Final Report 97:
Open Platform to Attract, Organize, and Coordinate Volunteers for Rural and Small Urban Transit,
proposes an online platform for transit agencies to register, organize, and manage
volunteers. A review of the limited literature on transit volunteering revealed an ongoing transition from
paper-based processes to technology adoption among agencies. However, existing technologies lacked
automation for task assignment and volunteer matching.
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Innovations in Freight Data: 2023 WorkshopFebruary 16, 2024 The 4th Innovations in Freight Data Workshop was held September 19–21,
2023, at the Keck Center of the National Academies of Sciences, Engineering and
Medicine in Washington, DC.
TRB's Transportation Research Circular E-C288: Innovations in Freight Data: 2023 Workshop
presents the discussions and presentations from the workshop.
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TR News 348: Transportation Influencer: Margaret-Avis Akofio-SowahFebruary 20, 2024 "This
year, TRB and members of the International Coordinating Council
are supporting an initiative I am leading to establish the African
Transportation Research Alliance, referred to by some as 'TRB in
Africa,'" says Margaret-Avis
Akofio-Sowah, a global organizational change
management lead for WSP and a TRB volunteer who is featured as
the Transportation Influencer in the January-March 2024 edition (Issue 348) of TR News, TRB's quarterly magazine.
TR News features timely articles on innovative and state-of-the-art research practice in all modes of transportation. It also includes brief news items of interest to the transportation community and research pays off articles, profiles of transportation professionals, workshop and conference announcements, new book notices, and news of TRB activities. Submissions of manuscripts for possible publication are accepted at any time.
Copies of TR News may be purchased individually or ordered on an annual subscription basis by emailing TRBsales@nas.edu. TRB policy is to release the full PDF version of a TR News four months after its release in print format.
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TR News 348: Fresh Perspectives: Native American Artists Portray Transportation’s ImpactFebruary 22, 2024 When gauging how roads,
rails, or runways affect the societies
they run through, the numbers
often paint an incomplete picture.
To illuminate the impact of transportation
on tribal communities, the TRB
Standing Committee on Native American
Transportation Issues took an imaginative
leap last year and announced a Call
for Artwork. The competition reflected
the committee’s focus on highlighting
and supporting transportation research
that benefits people within tribal communities
while balancing preservation
with improvements. "Fresh Perspectives: Native American Artists Portray Transportation’s Impact," by Sam Ricord and Joseph Parampathuis, detailed the work of the winners in the January-March 2024 edition (Issue 348) of TR News, TRB's quarterly magazine.
TR News features timely articles on innovative and state-of-the-art research practice in all modes of transportation. It also includes brief news items of interest to the transportation community and research pays off articles, profiles of transportation professionals, workshop and conference announcements, new book notices, and news of TRB activities. Submissions of manuscripts for possible publication are accepted at any time.
Copies of TR News may be purchased individually or ordered on an annual subscription basis by emailing TRBsales@nas.edu. TRB policy is to release the full PDF version of a TR News four months after its release in print format.
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Using Performance Engineered Mixtures to Improve Pavement Performance and Sustainability: State ExperiencesFebruary 23, 2024 To encourage adoption of performance engineered mixtures (PEM) concepts, the
U.S. Federal Highway Administration offered various levels of incentive
funding to state agencies to help offset the
costs of additional shadow testing, data collection, and reporting.
TR Circular E-C287: Using Performance Engineered Mixtures to Improve Pavement
Performance and Sustainability: State Experiences
presents important highlights from the PEM pilot projects in six states.
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Development of Clear Recovery Area GuidelinesFebruary 23, 2024 The clear zone concept for roadside design emerged in the mid-1960s as a single distance for
lateral clearance that reduced the likelihood of an errant vehicle striking a roadside obstacle.
Subsequent recovery area guidance that evolved over the next two decades provided a variable
distance expressed in terms of traffic volume, design speed, sideslope, and other roadway and
roadside factors.
NCHRP Research Report 1097: Development of Clear Recovery Area Guidelines,
from TRB's National Cooperative Highway Research Program,
develops updated guidelines for roadside clear zones expressed in terms of key roadway
and roadside design parameters. These updated guidelines can aid designers in better understanding the risk associated with roadside encroachments while recognizing and working within the associated design constraints.
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Mental Health, Wellness, and Resilience for Transit System WorkersFebruary 23, 2024 Transit agency leadership must make a real and concerted effort to take the mental health
and overall wellness of frontline workers more seriously. Leadership can play an important
role by making a clear commitment and dedicating resources to address mental health,
wellness, and resiliency at their agencies. Ultimately, this means that more funding and
staff resources are needed to address barriers and to develop, implement, and support
programs aimed at improving mental health, wellness, and resiliency. This includes
staff dedicated to implementing and monitoring holistic wellness programs.
TCRP Research Report 245: Mental Health, Wellness, and Resilience for Transit System Workers, a pre-publication from TRB's Transit Cooperative Research Program,
provides a detailed summary of common factors that influence the mental health, well-being,
and resiliency of frontline transit workers and includes a range of solutions that transit agencies
can implement to address them. Findings were determined using a mix of research methods, including
multiple interviews and focus groups with frontline employees, transit agency management, and union
leadership at two different points in the project.
Supplemental to the report are a Research Brief and an Implementation Plan.
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TR News 348: Fresh Perspectives: Artificial Intelligence Frontiers in TransportationFebruary 29, 2024 AI technologies have fueled advances in
autonomous driving and intelligent transportation
systems, for example, enabling
the public in Phoenix, San
Francisco, and other cities to hail
a self-driving taxi from their smartphone
apps. Transportation professionals also are
tapping computer-vision
technologies to
manage transportation
assets, collect traffic
data, and dynamically adjust traffic signals.
Despite such promising developments,
many who work in transportation
continue to see AI as a theoretical concept
in a black box and don’t know
how to successfully deploy projects that
could enhance safety and human decision
making in the real world.
"Artificial Intelligence Frontiers in Transportation," by Bo Wang,
David Reinke, and Yinhai Wang, highlights
several successful transportation applications
as well as the challenges and
risks of implementing them. In addition,
a few suggestions are offered on how
to successfully apply AI technology in
transportation. The article appears free online from the January-March
2024 edition (Issue 348) of TR News, TRB's quarterly magazine.
TR News features timely articles on innovative and state-of-the-art research practice in all modes of transportation. It also includes brief news items of interest to the transportation community and research pays off articles, profiles of transportation professionals, workshop and conference announcements, new book notices, and news of TRB activities. Submissions of manuscripts for possible publication are accepted at any time.
Copies of TR News may be purchased individually or ordered on an annual subscription basis by emailing TRBsales@nas.edu. TRB policy is to release the full PDF version of a TR News four months after its release in print format.
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Paratransit Fleet ConfigurationsMarch 1, 2024 The increase in the population of older adults who are ambulatory but are eligible to use
paratransit has increased the demand for paratransit service delivery. This growth has, in
turn, led some transit agencies to move away from standard one-vehicle type fleets in
favor of a mixed fleet incorporating smaller accessible vehicles and non-accessible
vehicles (generally sedans).
TCRP Synthesis 174: Paratransit Fleet Configurations,
from TRB's Transit Cooperative Research Program,
focuses on the different ways that transit agencies have configured their
dedicated paratransit fleets. The first wave of fleet configuration changes has provided some expected benefits of
lower operating costs and greater service delivery flexibility due to incorporating smaller
vehicles into the fleet mix. These changes have also brought forward a set of service
delivery issues, including increased costs, maintenace concerns, and complications in
the reassignment of riders.
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Connected and Autonomous Vehicle Technology: Determining the Impact on State DOT Maintenance ProgramsMarch 6, 2024 Traffic control devices,
markings, signals, guardrail, computing systems, communications infrastructure, and other permanent
and temporary devices will likely each be affected by the operation of
connected and
autonomous vehicle (CAV) technology. State departments of transportation (DOTs) need to identify
gaps in knowledge and skills and prepare for the challenges of CAV implementation while maintaining
the existing roadway system at an acceptable level of service.
NCHRP Research Report 1084: Connected and Autonomous Vehicle Technology: Determining the Impact on
State DOT Maintenance Programs,
from TRB's National Cooperative Highway Research Program,
provides an overview of how the implementation of CAV technology will likely impact the state of
practice for maintenance
programs within state DOTs.
Supplemental to the report are an Implementation Memo and a PowerPoint Presentation.
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Advanced Air Mobility and Community Outreach: A Primer for Successful Stakeholder EngagementMarch 6, 2024 Advanced Air Mobility (AAM) includes the use of new aircraft technologies to
transport passengers and cargo, typically on demand.
The AAM ecosystem will initially rely on existing
airports, heliports, and routes, but in the future, new dedicated facilities and routes will likely be
developed. The impacts of AAM may be far-reaching and affect many stakeholders.
ACRP Research Report 261: Advanced Air Mobility and Community Outreach: A Primer for
Successful Stakeholder Engagement, from TRB's Airport Cooperative Research Program,
offers strategies and tools to help airport operators encourage
and promote engagement with AAM operators, government agencies, and
communities.
Supplemental to the report is Appendix C: Stakeholder Engagement Toolkit.
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Prevention and Mitigation of Surficial Slope Failures on Fill Highway Embankment SlopesMarch 7, 2024 Surficial slope failures in highway fill embankments are shallow landslides that occur within the
embankment fill, usually
affecting only a portion of the slope’s height. These failures tend to occur after a
vulnerable embankment slope is subjected
to a triggering event. An embankment’s failure susceptibility generally depends on
factors such as slope steepness, material
composition, and ability to withstand adverse drainage conditions. Examples of trigger
mechanisms include intense rainfall,
snowmelt, seismic activity, and reshaping of the embankment.
NCHRP Synthesis 617: Prevention and Mitigation of Surficial Slope Failures on Fill Highway Embankment Slopes,
from TRB's National Cooperative Highway Research Program,
documents state departments of transportation practices on identification,
investigation, design guidance and requirements, prevention, and mitigation of surficial slope failures.
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Advancing Gender Equity in the DOT WorkforceMarch 8, 2024 Women comprise only 15 percent of
the transportation workforce, and this statistic declines in executive and leadership positions and
does not reflect those who may not identify as men or women. For women of color, the numbers
are even more disparate.
NCHRP Synthesis 618: Advancing Gender Equity in the DOT Workforce,
from TRB's National Cooperative Highway Research Program,
documents current state departments of transportation (DOT)
practices related to advancing gender equity in DOT workforces.
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Design and Construction of Temporary Facilities in Streams and Rivers: Hydraulic and Hydrologic Engineering Considerations and PracticesMarch 8, 2024 State departments of transportation undertake hundreds of construction projects each year that affect, and are affected by, streams and rivers. These projects include replacement and rehabilitation of bridges and culverts, as well as new construction and rehabilitation of highways in stream corridors. While the hydraulic design standards for the completed bridge, culvert, or highway are well established, there are elements of risk involved in any temporary occupancy of a waterway for construction, including: personal safety risks, economic risks to the transportation agency and contractor from delays or damage, and environmental risk from unanticipated flooding.
NCHRP Synthesis 619: Design and Construction of Temporary Facilities in Streams and Rivers: Hydraulic and
Hydrologic Engineering Considerations and Practices,
from TRB's National Cooperative Highway Research Program,
documents state DOT hydraulic and hydrologic engineering considerations and practices
for design and construction of temporary facilities in streams and rivers.
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DOT Practices on Road Safety AuditsMarch 8, 2024 One tool utilized by some departments of transportation (DOTs) to improve safety
performance is conducting road safety audits (RSAs), also known as “road safety assessments.”
An RSA is a formal evaluation of the safety performance of an existing or future highway
segment or intersection performed by an independent, multidisciplinary team.
NCHRP Synthesis 615: DOT Practices on Road Safety Audits,
from TRB's National Cooperative Highway Research Program,
seeks to address the need for more knowledge regarding DOT practices for conducting RSAs.
Supplemental to the report is Appendix C: Summary of Existing Literature, Policies, and Guidance for RSAs.
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Integrating Traffic Incident Management and Connected, Automated Technology Communities: A Guide for Communicating and ConnectingMarch 15, 2024 As vehicle technology advances, Traffic Incident Management (TIM) and emergency responders (ERs)
are facing unprecedented circumstances in knowing how to engage with and respond to connected,
automated vehicles (CAV). Uncertainty is complicated by limited communications and information
exchanged between CAV developers, TIM, and ERs.
NCHRP Research Report 1104: Integrating Traffic Incident Management and Connected, Automated Technology Communities: A Guide for Communicating and Connecting,
from TRB's National Cooperative Highway Research Program,
aims to provide the resources to foster active collaboration and connection between CAV developers, TIM, ERs. The guide serves to equip ERs and members of the TIM community with the information, tools, and communication products to effectively engage CAV developers, CAV technologies, and the broader CAV industry.
Supplemental to the report is NCHRP Web-Only Document 395: Impacts of Connected, AutomatedVehicle Technologies on Traffic Incident Management Response.
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Impacts of Connected, Automated Vehicle Technologies on Traffic Incident Management ResponseMarch 15, 2024 Traffic Incident Management (TIM) is the process to detect, respond to, and clear traffic
incidents so that traffic flow may be restored
as safely and quickly as possible. Traffic incidents are unplanned events, such as crashes,
that impact traffic flow, and TIM refers to the coordinated process to respond to and clear the incidents.
NCHRP Web-Only Document 395: Impacts of Connected, Automated
Vehicle Technologies on Traffic Incident Management Response,
from TRB's National Cooperative Highway Research Program,
aims to understand how connected and automated vehicles (CAVs) may impact TIM activities,
including potential risks and
benefits, and how (or if) responders are currently engaging with these technologies.
The document is supplemental to
NCHRP Research Report 1104: Integrating Traffic Incident Management and Connected, Automated Technology Communities: A Guide for Communicating and Connecting. Supplemental to the document are an Implementation Plan, a Project Overview Presentation, and a White Paper that relates emergency response and CAV technology in the context of eight scenarios.
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Integration of Contingency Planning for Small AirportsMarch 15, 2024 Contingency planning is crucial for small airports to best position themselves for addressing
disruptions and contingencies - such as the COVID-19 pandemic - that impact staffing, financial
and information technology resources, infrastructure, facilities, and/or supply chain shortages.
ACRP Web-Only Document 59: Integration of Contingency Planning for Small Airports,
from TRB's Airport Cooperative Research Program,
provides resources, tools, and examples of integration that
can guide future efforts undertaken by small airports. Smart, integrated contingency planning can
minimize the operational and economic impacts to airports and their stakeholders and those who depend on their
services.
Supplemental to the report is a Conduct of Research, a Checklist and Calendar, a Checklist of Contingency Plans, a Checklist of Exercise Types, a Contingency Plan Deconfliction Tool, a Contingency Planning and Integration Tree, Crisis Communications, an EOC Tool, a Course Selection Guide, and a Succession Planning Tool.
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Playbook for Developing a Culture of Innovation at AirportsMarch 19, 2024 When airports create an environment where their people can improve current processes and adapt to rapid changes in the industry—particularly when they focus on solving problems for customers—great advances can be made. Organizations that support a culture of innovation also reap the benefits of improved morale and increased motivation among their staff.
ACRP WebResource 16: Playbook for Developing a Culture of Innovation at Airports, from TRB’s Airport Cooperative Research Program, provides best practices, actionable plays, and various resources that will enable airports to drive cultural change that supports innovation.
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Selection and Application of Manning’s Roughness Values in Two-Dimensional Hydraulic ModelsMarch 20, 2024 Measures to improve the accuracy, reliability, and consistency in selecting roughness values for the
application of 2D hydraulic models at highway crossings and in transportation corridors will represent a
major step forward in the evolving state of practice. Whether a
one-dimensional or a 2D modeling approach is taken, inconsistencies can exist from state
to state, and even within states at the various district levels, on how to develop accurate and reliable
hydraulic models. The fundamental issue is the selection and assignment of Manning’s roughness values
for a variety of channel types and land uses.
NCHRP Research Report 1077: Selection and Application of Manning’s
Roughness Values in Two-Dimensional Hydraulic Models,
from TRB's National Cooperative Highway Research Program,
presents guidelines for the selection and application of
Manning’s roughness values for 2D hydraulic models.
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Developing an Airport Communicable Disease Response Plan: Guide and TemplateMarch 22, 2024 As air travel continues to increase worldwide, threats from communicable disease transmission via air
travel remains a top public health concern. Airports can serve as a setting for potential community
spread while simultaneously, communicable diseases can adversely impact airport operations.
ACRP Web-Only Document 57: Developing an Airport Communicable Disease Response Plan: Guide and Template,
from TRB's Airport Cooperative Research Program,
provides airport operators with the fundamental
information needed to understand communicable diseases and their intersection with airports, an
understanding of the range of factors that influence communicable disease incidents in airport contexts,
and detailed actions that airport practitioners can consider to develop and implement an airport
communicable disease response plan.
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Quality Processes for Bridge Analysis ModelsApril 3, 2024 The design of bridges often involves the use of structural analysis models of varying
degrees of complexity. A variety of analysis methods and software can be used to create
and analyze these models, and the process can be quite complex, with significant amounts of
input and output data. Quality assurance and quality control are two essential processes.
NCHRP Synthesis 620: Quality Processes for Bridge Analysis Models,
from TRB's National Cooperative Highway Research Program,
documents state department of
transportation (DOT) practices related to the quality assurance and quality control
processes for bridge structural models.
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Truck Emergency Escape Ramp Design and OperationApril 4, 2024 Many state departments of transportation (DOTs) build and operate escape ramps to allow heavy
trucks that cannot maintain safe speeds on steep downgrades to safely exit the highway instead
of losing control and crashing. Some escape ramps use upward-sloping beds of loose aggregate
to slow the vehicles, while others employ passive or active mechanical devices such as cables to
slow the vehicles. Some agencies use intelligent transportation technologies to detect trucks that
are driving at excessive speeds for the location and to provide information to truckers regarding
emergency escape ramp locations.
NCHRP Synthesis 621: Truck Emergency Escape Ramp Design and Operation,
from TRB's National Cooperative Highway Research Program,
documents practices used
by state DOTs to design and operate facilities to detect, guide, and capture out-of-control
vehicles travelling on steep downgrades.
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Using Cooperative Automated Transportation Data for Freeway Operational Strategies April 4, 2024 Since the introduction of digital computers more than 50 years ago, continuous developments in
computer technology, emerging data sources, and communications have created opportunities for
operational strategies and performance measures to improve freeway network safety and mobility.
NCHRP Research Report 1080: Using Cooperative Automated Transportation Data for Freeway Operational
Strategies, from TRB's National Cooperative Highway Research Program,
is an assessment of transportation operational scenarios and use cases where
freeway operational strategies could be improved through the transmission of data between a
transportation management system and the larger cooperative automated transportation
system.
Supplemental to the report is a source code archive, a PowerPoint presentation, and an Implementation Plan.
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Transformational Technologies and Mobility Inclusion PlaybookApril 4, 2024 Changes in technology provide opportunities and risks to mobility, particularly as they relate to
traditionally and newly underserved populations. In recent years, economic, environmental, and social
forces have quickly given rise to shared and on-demand mobility—a collective of entrepreneurs and
consumers leveraging technology to maximize transportation and financial resources and generate capital.
For instance, shared mobility services have become part of a trend that has pushed shared, on-demand
mobility from the fringe into the mainstream.
TCRP Research Report 244/NCHRP Research Report 1101: Transformational Technologies and Mobility
Inclusion Playbook,
from TRB's Transit Cooperative Research Program and National Cooperative Highway Research Program,
is a playbook of resources for public and private entities to assess, plan, and measure
their progress toward achieving transportation equity and inclusive mobility in an era of transformational
technology.
Supplemental to the report are
a Research Background and Appendix B: Stakeholder Interviews,Appendix C: Underserved Population Focus Groups, and Appendix D: Underserved Population Survey.
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Transformational Technologies and Mobility Inclusion PlaybookApril 4, 2024 Changes in technology provide opportunities and risks to mobility, particularly as they relate to
traditionally and newly underserved populations. In recent years, economic, environmental, and social
forces have quickly given rise to shared and on-demand mobility—a collective of entrepreneurs and
consumers leveraging technology to maximize transportation and financial resources and generate capital.
For instance, shared mobility services have become part of a trend that has pushed shared, on-demand
mobility from the fringe into the mainstream.
TCRP Research Report 244/NCHRP Research Report 1101: Transformational Technologies and Mobility
Inclusion Playbook,
from TRB's Transit Cooperative Research Program and National Cooperative Highway Research Program,
is a playbook of resources for public and private entities to assess, plan, and measure
their progress toward achieving transportation equity and inclusive mobility in an era of transformational
technology.
Supplemental to the report are
a Research Background, Appendix B: Stakeholder Interviews,Appendix C: Underserved Population Focus Groups, and Appendix D: Underserved Population Survey.
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Wintertime Pavement Maintenance PracticesApril 4, 2024 State transportation agencies have many tools available with which to maintain pavements proactively.
These include tools such as pavement management systems to track roadway conditions and life
cycle cost analysis tools.
NCHRP Synthesis 623: Wintertime Pavement Maintenance Practices,
from TRB's National Cooperative Highway Research Program,
documents the current state DOT practices for the reactive pavement maintenance
performed during the winter months when flexible and rigid pavements must be repaired to keep the roadway system fully
operational.
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Combined High-Visibility Enforcement: Determining the EffectivenessApril 4, 2024 The National Highway Traffic Safety Administration defines high-visibility enforcement (HVE) as a universal
traffic safety approach designed to create deterrence and change unlawful traffic behaviors. HVE
combines highly visible and proactive law enforcement targeting a specific traffic safety issue.
Law enforcement efforts are combined with visibility elements and a publicity strategy to
educate the public and promote voluntary compliance with the law.
BTSCRP Research Report 10: Combined High-Visibility Enforcement: Determining the Effectiveness,
from TRB's Behavorial Traffic Safety Cooperative Research Program,
provides State Highway Safety Offices (SHSOs) and other safety
organizations with an improved understanding of safety outcomes associated with conducting
combined HVE.
Supplemental to the report are Appendices A and B, which contain the survey given to
agencies and a summary of common data collected and metrics used to implement and evaluate HVE campaigns,
an Implementation Plan, and Recommendations for additional research.
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MASH TL-3 Deflection Reduction for 31-Inch Guardrail: A GuideApril 9, 2024 Roadside obstacles are often too close to the roadway to permit the installation of common guardrail
designs. Guardrail systems are often modified with a
combination of tighter post spacing, nesting of rails, and other guardrail stiffening mechanisms to reduce
deflections.
NCHRP Research Report 1100: MASH TL-3 Deflection Reduction for 31-Inch Guardrail: A Guide,
from TRB's National Cooperative Highway Research Program,
presents a guide on the use of stiffening mechanisms to reduce the
deflection for 31-inch guardrail installations while maintaining system integrity and safety performance.
Supplemental to the report are two presentations summarizing the project, one including videos of crash testing
and another without the crash-testing videos.
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TR News 348: Intercity Buses: Planning for a Post-Pandemic ParadigmApril 11, 2024 The intercity bus industry experienced unprecedented growth before the COVID-19 pandemic and seemed poised for further expansion. The industry embraced technology to provide dynamic scheduling and pricing, booking and boarding were simplified through customer-friendly applications and electronic ticketing, and customers were enticed by free Wi-Fi and
onboard entertainment.
" Intercity Buses: Planning for a Post-Pandemic Paradigm," by Matthew W. Daus, details that while a full recovery has not yet occurred, ridership is steadily increasing and operators are adding more routes and new services. He posits that intercity buses could be poised to come back stronger than before.
The article appears free online from the January-March
2024 edition (Issue 348) of TR News, TRB's quarterly magazine.
TR News features timely articles on innovative and state-of-the-art research practice in all modes of transportation. It also includes brief news items of interest to the transportation community and research pays off articles, profiles of transportation professionals, workshop and conference announcements, new book notices, and news of TRB activities. Submissions of manuscripts for possible publication are accepted at any time.
Copies of TR News may be purchased individually or ordered on an annual subscription basis by emailing TRBsales@nas.edu. TRB policy is to release the full PDF version of a TR News four months after its release in print format.
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Subgrade Soil Susceptibility to Shrink/Swell and Frost Heave: Effects on Pavement PerformanceApril 12, 2024 Expansive clay soils that are susceptible to shrink and swell and silty soils that
are susceptible to frost heave are found in many parts of the United States. At these
locations, these soils serve as the subgrade of the pavement structure.
NCHRP Research Report 1096: Subgrade Soil Susceptibility to Shrink/Swell and Frost Heave: Effects on Pavement Performance,
from TRB's National Cooperative Highway Research Program,
presents a state-of-the-art update to pavement design procedures to better reflect the influence of
subgrade soils susceptible to shrink/swell and/or frost heave on pavement performance.
Supplemental to the report is a dataset of
appendices with research information for each chapter of the report.
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Tactile Wayfinding in Transportation Settings for Travelers Who Are Blind or Visually ImpairedApril 12, 2024 Travelers who are blind or visually impaired use a variety of cues and strategies to orient
themselves within their surroundings and move through space to where they want to go. This
wayfinding process can be particularly challenging in complex urban environments where some
cues, such as detectable edge treatments, the sound of surging parallel traffic, or other
indicators may be inconsistent, confusing, misleading, or missing.
TCRP Research Report 248: Tactile Wayfinding in Transportation Settings for Travelers Who Are Blind or
Visually Impaired,
from TRB's Transit Cooperative Research Program,
seeks to help provide consistency of tactile walking surface indicators and guidelines for their use in multimodal environments.
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Practices for Statewide and MPO CoordinationApril 17, 2024 State departments of transportation (DOTs) are required by federal law to coordinate transportation planning and programming processes with metropolitan planning
organizations (MPOs) in the state. However, state DOTs and MPOs have varying coordination practices depending on their specific contexts.
NCHRP Synthesis 626: Practices for Statewide and MPO Coordination,
from TRB's National Cooperative Highway Research Program,
documents current DOT strategies and practices to facilitate coordination between state
DOTs and MPOs as well as common challenges and obstacles to coordination.
Supplemental to the report is Appendix C, which includes documents, legislation, and guidance related to coordination between DOTs and MPOs.
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Programmatic Implementation of Alternative Contracting MethodsApril 17, 2024 Alternative contracting methods (ACMs), including design-build, construction manager/general
contractor, and public-private partnerships have added a wide range of options
for state departments of transportation (DOTs) to consider when delivering projects.
NCHRP Synthesis 625: Programmatic Implementation of Alternative Contracting Methods,
from TRB's National Cooperative Highway Research Program,
documents state DOT practices of programmatic approaches to ACMs.
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Addressing Climate Resilience and Greenhouse Gases in the Transportation Planning ProcessDecember 31, 2024 Many state departments of transportation (DOTs) are undergoing organizational changes to address climate
change. Changes range from hiring additional staff to creating new offices within
the organizational structure of the agency. State requirements in the form of legislation,
executive orders, and climate action
plans are primary drivers for state DOT involvement with climate change.
NCHRP Synthesis 624: Addressing Climate Resilience and Greenhouse Gases in the Transportation Planning Process,
from TRB's National Cooperative Highway Research Program,
documents practices and procedures at state DOTs regarding climate change.
Supplemental to the report is Appendix C, a compilation of weblinks to state climate change documents.
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Operational Performance and Safety Effects of Arterial Weaving SectionsDecember 31, 2024 As drivers place increasing demands on transportation infrastructure and freeway congestion continues to increase, arterials have become an alternative route for many drivers, resulting in the lower performance of these roadways. In many areas, weaving maneuvers – defined as the crossing of two or more traffic streams in the same direction between two or more access points on a multilane urban street with some type of traffic control – negatively affect arterial operations and safety.
NCHRP Research Report 1094: Operational Performance and Safety Effects of Arterial Weaving Sections,
from TRB's National Cooperative Highway Research Program,
presents a deterministic methodology for evaluating the operational performance of weaving sections on arterials.
Supplemental to the report are appendices and a bibliography, a computational engine, a North Carolina case study, a Texas case study, and a PowerPoint presentation of instructional materials.
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New Mobility Options in Travel Demand Forecasting and Modeling: A GuideDecember 31, 2024 Emerging transportation technologies and shared mobility services, or new mobility options (NMOs), are affecting travel behavior
and demand. NMOs may include shared micromobility, transportation networking companies (TNCs), and
connected and autonomous vehicles (CAVs). As NMOs grow in availability and use, transportation
planners and decision-makers need to be able to understand how to harness positive and mitigate negative
impacts.
NCHRP Research Report 1113: New Mobility Options in Travel Demand Forecasting and Modeling: A Guide,
from TRB's National Cooperative Highway Research Program,
provides travel demand modeling practitioners with ways to consider NMOs in travel demand forecasting models (TDFMs) - one of
the primary tools available to understand potential impacts and future uncertainties.
Supplemental to the report are
NCHRP Web-Only Document 399: Developing a Guide for New Mobility Options in Travel Demand Forecasting and Modeling;
datasets of Use Case 1: Data, Code, and Tutorials for Household Vehicle Ownership Use Case;
Use Case 2: Data, Code, and Tutorials for Household Trip Rates Use Case;
Use Case 3: Data, Code, and Tutorials for Mode Choice Use Case;
an Implementation of Research Findings and Products document; and
a PowerPoint presentation of the research.
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Incorporating Resilience into Transportation NetworksDecember 31, 2024 Transportation networks are comprised of infrastructure, institutions, and individuals in diverse
roles. When networks are disrupted, relationships between these roles can determine the cost,
duration, and extent of impact for the entire system. Coordination between people, institutions, and
the network assets they engage is essential to the success of any transportation resilience strategy.
NCHRP Web-Only Document 391: Incorporating Resilience into Transportation Networks,
from TRB's National Cooperative Highway Research Program,
provides an easy, digestible resource for understanding the components of network
resilience, how to build and sustain resilience teams, and how to implement collaborative resilience
strategies at the network level.
Supplemental to the report are an Executive Summary; Video Modules 1, 2, and 3;
a Resilience Brochure; an Implementation Report; and a Presentation.
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Practices to Identify and Mitigate PFAS Impacts on Highway Construction Projects and Maintenance OperationsDecember 31, 2024 Per- and polyfluoroalkyl substances (PFAS) are a class of more than 6,000 contaminants of
emerging concern that can harm both ecosystems and human health. These anthropogenic
compounds contain carbon–fluorine bonds that make them stable and persistent in the
environment, earning them the nickname “forever chemicals.”
NCHRP Synthesis 630: Practices to Identify and Mitigate PFAS Impacts on Highway Construction Projects
and Maintenance Operations,
from TRB's National Cooperative Highway Research Program,
documents current state departments of transportation practices for identifying
locations of potential PFAS contamination and mitigating the impacts of PFAS related to
highway construction and maintenance operations. This study considers PFAS impact and
mitigation efforts in all phases of highway project development (planning, design, right-of-way
acquisition), construction, and maintenance.
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PFAS Management at Airports: A GuideDecember 31, 2024 Per- and polyfluoroalkyl substances (PFAS) are found in many products, from consumer products to building materials. For airports,
the primary implication is associated with aqueous film-forming foams (AFFFs) used in firefighting. For many
years, airport operators were required to use AFFFs and, as a result of recommended training
requirements and fire response, may have had releases of AFFFs to the environment.
ACRP Research Report 262: PFAS Management at Airports: A Guide,
from TRB's Airport Cooperative Research Program,
provides information and practical considerations for managing AFFFs
containing PFAS used for firefighting at airports. It also
includes education and public outreach materials to support community involvement efforts.
Supplemental to the report are Appendix A (Toolkit on Assessing Current and Historical Product Use and Activities), Appendix B (Toolkit on Policies, Procedures, and Operations), Appendix C (Toolkit on Regulatory Action, Financial Planning, and Remediation), Appendix D (Toolkit on Communication and Public Engagement), Appendix E (Research Methodology), and Appendix F (Aviation Stakeholder Group Survey).
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Measuring the Characteristics of Pavement Surface ImagesDecember 31, 2024 Imaging systems are commonly used for conducting pavement evaluations. The American
Association of State Highway and Transportation Officials' Standard Practice for
Collecting Images of Pavement Surfaces for Distress Detection
addresses the collection of images. However, there are no widely accepted methods for
measuring the characteristics of pavement surface images such as 2-dimensional optical images
and 3-dimensional surface elevation images.
NCHRP Research Report 1106: Measuring the Characteristics of Pavement Surface Images,
from TRB's National Cooperative Highway Research Program,
presents a state-of-the-art update of methods for measuring and evaluating the characteristics of
pavement surface images collected by 3-dimensional pavement imaging systems.
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State DOT Product Evaluation ProcessesDecember 31, 2024 The construction, maintenance, and operation of transportation infrastructure require
immense amounts of products and materials. New products, materials, engineered
systems, and innovative technologies are presented to state departments of
transportation (DOTs) by suppliers and manufacturers, as well as sometimes by
contractors and internal DOT staff.
NCHRP Synthesis 616: State DOT Product Evaluation Processes,
from TRB's National Cooperative Highway Research Program,
documents current state DOT
practices, funding, policies, management techniques, tools, and workflows of product evaluation
processes.
Supplemental to the report is a dataset of various administrative documents from different state DOTs.
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Ancillary Asset Data Stewardship and ModelsDecember 31, 2024 Some state departments of transportation (DOTs) have begun to track data pertaining to ancillary
assets (that is, assets other than pavements and bridges) in their Transportation Asset
Management Plans. However, most DOTs do not track this information, even though
they inventory and manage many of these ancillary assets.
NCHRP Synthesis 628: Ancillary Asset Data Stewardship and Models,
from TRB's National Cooperative Highway Research Program,
documents state DOT practices related to data models and
data stewardship of ancillary assets.
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Integrating Performance-Based Planning into Long-Range Transportation Plans and STIPsDecember 31, 2024 State departments of transportation (DOTs) must develop long-range transportation plans
(LRTPs) and State Transportation Improvement Programs (STIPs) as key products of the
transportation planning process. DOTs have a long history of developing these documents
through many cycles of planning.
NCHRP Synthesis 631: Integrating Performance-Based Planning into Long-Range Transportation Plans and STIPs,
from TRB's National Cooperative Highway Research Program,
documents current practices of state DOTs related to integrating federally
required performance-based plans with LRTPs and STIPs.
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Risks Related to Emerging and Disruptive Transportation Technologies: A GuideDecember 31, 2024 Emerging technologies present many potential challenges to state departments of transportation
(DOTs) and other agencies that own and manage the existing infrastructure. Significant
uncertainty exists about which changes are most likely to occur and where the largest impacts
could be, hampering an effective national alignment in policy and approach.
NCHRP Research Report 1090: Risks Related to Emerging and Disruptive Transportation Technologies: A Guide,
from TRB's National Cooperative Highway Research Program, presents a register of risks to state and local transportation agencies and their
constituents posed by four emerging technologies: electric vehicles (EVs), connected
autonomous vehicles (CAVs), mobility on demand/mobility as a service (MOD/MaaS), and
advanced air mobility (AAM).
Supplemental to the report are
a PowerPoint presentation describing the research and an implementation plan.
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Guide for Response Planning, Assessment, and Rapid Restoration of Service of Bridges in Extreme EventsDecember 31, 2024 Extreme events resulting from natural or other disasters, such as fires, floods,
earthquakes, tornados, and hurricanes, can damage bridge structures in ways that impact the
safety of motorists and the public. The procedures currently employed for response planning,
assessment, and rapid restoration of service of these structures to maintain safety do not always
address the full range of needs for personnel, communication, coordination, data collection,
assessment levels, and other factors associated with the different types and extents of these
events.
NCHRP Research Report 1098: Guide for Response Planning, Assessment, and Rapid Restoration
of Service of Bridges in Extreme Events,
from TRB's National Cooperative Highway Research Program,
provides information and guidance on all
aspects of response planning, assessment, and rapid restoration of service of bridge structures in
extreme events.
Supplemental to the report are
NCHRP Web-Only Document 390: Response Planning, Assessment, and Rapid Restoration of Service of
Bridges in Extreme Events: Background and Summary, the
Bridge Assessment and Rapid Restoration Toolbox (BARRT), and a BARRT user manual.
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Response Planning, Assessment, and Rapid Restoration of Service of Bridges in Extreme Events: Background and SummaryDecember 31, 2024 Extreme events, such as hurricanes, tornados, floods, earthquakes, fires, and collisions, pose a threat to the
transportation infrastructure that millions of people depend on daily.
NCHRP Web-Only Document 390: Response Planning, Assessment, and Rapid Restoration of Service of
Bridges in Extreme Events: Background and Summary,
from TRB's National Cooperative Highway Research Program,
supplements the information and guidance on all aspects of response planning, assessment, and rapid restoration of service of bridge structures in extreme events contained in
NCHRP Research Report 1098: Guide for Response Planning, Assessment, and Rapid Restoration
of Service of Bridges in Extreme Events.
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Use of Marginal and Unconventional-Source Coal Ashes in ConcreteDecember 31, 2024 In recent years, supplies of high-quality, freshly produced coal ash have declined due to
increasing environmental controls and shutdowns of coal-fired powerplants in the United States
and elsewhere. While supply has decreased, demand for coal ash for concrete
construction is the same or greater, as coal ash is a crucial component for producing sustainable
and durable concrete.
NCHRP Research Report 1105: Use of Marginal and Unconventional-Source Coal Ashes in Concrete,
from TRB's National Cooperative Highway Research Program,
aims (1) to propose recommendations for revising the AASHTO
M 295 Standard Specification for Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use
in Concrete to allow use of unconventional coal ashes while not compromising the desired
properties of the fresh and hardened concrete, and (2) to provide guidelines for using coal ash not
meeting the recommended revised specification.
Supplemental to the report are Appendices 1 through 5.
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Post-Construction Evaluation Practices for Highway Projects Delivered Using Alternative Contracting MethodsDecember 31, 2024 Alternative contracting methods (ACMs) capture the delivery methods that are not design-bid-build
(D-B-B), low bid, or traditional federal aid. Common ACMs used by state departments of
transportation (DOTs) include design-build (D-B), construction manager/general contractor
(CM/GC), progressive design-build (P-D-B), public-private partnerships (P3), and indefinite
delivery/indefinite quantity (IDIQ), which is also called job order contracting.
NCHRP Synthesis 622: Post-Construction Evaluation Practices for Highway Projects Delivered
Using Alternative Contracting Methods,
from TRB's National Cooperative Highway Research Program,
investigates and documents DOT practices for evaluating the
outcomes of the ACM processes after project completion.
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Practices for Capturing and Integrating Cost Data in Maintenance Management SystemsDecember 31, 2024 State departments of transportation (DOTs) face considerable challenges in implementing, enhancing,
or replacing their existing maintenance management systems (MMSs). These processes are not only
expensive and time-consuming but also involve considerable risk, because these systems have
usually been in place for many years.
NCHRP Synthesis 629: Practices for Capturing and Integrating Cost Data in Maintenance Management Systems,
from TRB's National Cooperative Highway Research Program,
documents current DOT practice for capturing maintenance costs in an MMS, including a look at the level
of detail captured, the quality of the data, the level of integration with
other agency systems, and the operational and business value of the data.
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Taxonomy and Terms for Stakeholders of Older Adult MobilityDecember 31, 2024 The community of stakeholders in safe mobility for older adults use technical terms or
expressions that can have very specific meanings across disciplines. The variety of
different interpretations often leads to miscommunication. Moreover, the terminology
continually changes to keep pace with advances in technology, measurement tools and
methods, and transportation options.
TRB's
Transportation Research Circular E-C289: Taxonomy and Terms for Stakeholders of Older Adult Mobility provides a reference document for usage of
terminology clarification to be used by stakeholders in older adult mobility. This includes
professionals and groups engaged in driver evaluation and rehabilitation services, research and program development, education and training, alternative transportation, and others such as psychologists and social workers who may encounter older adults with
limited mobility and be asked to help identify potential solutions.
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Selecting Ramp Design Speeds, Vol. 1: GuideDecember 31, 2024 Design speed is used to determine all pertinent
highway features to obtain a balanced design. Over an extended length of highway, it is desirable
to select a uniform design speed.
The TRB National Cooperative Highway Research Program's
NCHRP Web-Only Document 313: Selecting Ramp Design Speeds, Vol. 1: Guide
provides guidelines for selecting appropriate design speeds specifically for ramps, based on a combination of
contextual considerations and quantitative information.
Supplemental to the document is a Ramp Speed Profile Model and NCHRP Web-Only Document 313: Selecting Ramp Design Speeds, Vol. 2: Conduct of Research Report.
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Selecting Ramp Design Speeds, Vol. 2: Conduct of Research ReportDecember 31, 2024 Designing
extended sections of highway based on the road design speed is relatively straightforward.
However, when applied to interchange ramps where high-speed facilities meet low-speed
facilities and drivers are expected to accelerate or decelerate over short distances, application of
the design speed is more complex.
The TRB National Cooperative Highway Research Program's
NCHRP Web-Only Document 313: Selecting Ramp Design Speeds, Vol. 2: Conduct of Research Report
presents the overall research findings including the literature review,
survey, and interviews with selected designers; details about the speed data collected during the
study; statistical analyses to develop speed prediction models for ramps; project summary and
future research needs; and recommended changes to the AASHTO Green Book.
Supplemental to the document is a Presentation. and NCHRP Web-Only Document 313: Selecting Ramp Design Speeds, Vol. 1: Guide.
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Practices for Controlling Tunnel LeaksDecember 31, 2024 Water infiltration is a common problem in tunnels. Such infiltration accelerates the deterioration of the
structure and elements within and creates hazards in the form of icicles and slippery roadways. The
severity of water infiltration often reflects various factors, so determining the appropriate remedy is
challenging and frequently requires an extensive investigation to understand the source and location of
the leak, the structural details of the tunnel, and the geology of the surrounding substrate.
NCHRP Synthesis 627: Practices for Controlling Tunnel Leaks,
from TRB's National Cooperative Highway Research Program,
documents the methods and practices used by state department of transportation (DOT)
tunnel owners to control tunnel leaks.
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Multistate Coordination and Harmonization for AV LegislationDecember 31, 2024 Automated vehicles (AVs) in the United States are currently regulated by an inconsistent patchwork of
state laws and executive orders, and no federal law. In the interests of spurring
advances, the federal government has chosen not to heavily regulate AVs,
but rather set high-level policy goals and foster technological innovation.
NCHRP Legal Research Digest 91: Multistate Coordination and Harmonization for AV Legislation,
from TRB's National Cooperative Highway Research Program,
provides guidance for multistate coordination and
harmonization for AV legislation for Level 3 through 5
vehicles.
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Assessing Lifecycle and Human Costs of Bus Operator Workstation Design and ComponentsDecember 31, 2024 Driving trucks and buses is a physically demanding occupation that carries one of the highest injury rates
of major occupational categories in the United States. Drivers often work in postures that increase risk
of low back pain and other musculoskeletal disorders, slow their response time, and put them at
increased risk for acute injuries due to crashes.
TCRP Research Report 247: Assessing Lifecycle and Human Costs of Bus Operator Workstation Design and Components,
from TRB's Transit Cooperative Research Program,
creates an easy-to-use toolkit for predicting the long-term safety and
promotion of a healthy environment within bus operator workstations.
Supplemental to the report is a spreadsheet tool.
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Innovation Programs and Practices of State Departments of TransportationDecember 31, 2024 The focus on innovation across state departments of transportation (DOTs) continues to grow
and strengthen. Unlike research activities, which have established programs and processes,
innovation programs are relatively new. DOTs are focusing more directly on innovation,
including that related to internal organizational excellence and external program and project
development and delivery.
NCHRP Synthesis 633: Innovation Programs and Practices of State Departments of Transportation,
from TRB's National Cooperative Highway Research Program,
documents state DOT innovation programs and initiatives,
areas of focus on the innovation spectrum, and associated activities.
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Improving Rider Safety for Mopeds and Seated Motor Scooters of 50cc or LessDecember 31, 2024 Relative to passenger cars, two- and three-wheeled vehicles such as motorcycles, mopeds, and
seated motor scooters (50cc or less) are associated with a higher risk for fatalities and serious
injuries in the event of a traffic crash, as they do not offer the protection of an enclosed vehicle
or include other safety enhancement features such as occupant restraints.
BTSCRP Research Report 11: Improving Rider Safety for Mopeds and Seated Motor Scooters of 50cc or Less,
from TRB's Behavioral Traffic Safety Cooperative Research Program,
provides state highway safety offices and other safety
organizations with information and tools to help improve moped and seated motor scooter rider
safety.
Supplemental to the report are
BTSCRP WebResource 2: Mitigation Tools for Improving Rider Safety on Mopeds and Seated Motor Scooters,
a Moped/Scooter Safety Plan Development Guide, and a Technical Memorandum on Implementation. |
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