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Access Management Manual, Second Edition

    Guide to Alternative Technologies for Preventing and Mitigating Vehicle Intrusions into Highway Work Zones
    6/24/2022 4:00:11 PM
    Work zone intrusion technologies are designed to warn workers and drivers of potential intrusion, provide a barrier to prevent intrusion, detect and alert drivers and workers during intrusion, and/or protect workers and drivers following intrusion. The TRB National Cooperative Highway Research Program's NCHRP Research Report 1003: Guide to Alternative Technologies for Preventing and Mitigating Vehicle Intrusions into Highway Work Zones is designed to be applicable to the construction and maintenance work...


    Reliability-Based Geotechnical Resistance Factors for Axially Loaded Micropiles
    6/17/2022 2:49:55 PM
    Micropiles are small-diameter drilled and grouted deep foundation elements used in various applications that often involve superstructure or ground conditions where construction of other foundation types is not practical. The TRB National Cooperative Highway Research Program's NCHRP Research Report 989: Reliability-Based Geotechnical Resistance Factors for Axially Loaded Micropiles details the development of reliability-based geotechnical resistance factors for axially loaded micropiles and related desig...


    Managing Performance to Enhance Decision-Making: Making Targets Matter
    6/9/2022 2:00:31 PM
    When targets matter, they drive transportation agency decisions and actions. The TRB National Cooperative Highway Research Program's NCHRP Research Report 993: Managing Performance to Enhance Decision-Making: Making Targets Matter offers a set of feedback enrichment strategies illustrated by case studies of how agencies are effectively incorporating people- and data-based feedback into decision-making on transportation issues ranging from long-term strategy development to medium-term program development ...


    Rural Transportation Issues: Research Roadmap
    6/1/2022 6:00:59 PM
    Although only 19% of the population live in rural areas, more than 70% of the U.S.’s four million miles of roadways are in rural areas. The rural transportation system also includes numerous airports; railways; inland and coastal waterways; rural and intercity buses; and bicycle, pedestrian, and multi-use paths and trails. In addition, approximately 47% of the nation’s motor vehicle fatalities occur in rural areas. The TRB National Cooperative Highway Research Program's  NCHRP Research Report 988: R...


    Federal Funding Uncertainty in State, Local, and Regional Departments of Transportation: Impacts, Responses, and Adaptations
    5/20/2022 6:00:24 PM
    Historically, federal funding for transportation investment in the United States has been provided through multiyear authorization acts providing predictable levels of funding to state departments of transportation (DOTs) and local transportation agencies, including metropolitan planning organizations (MPOs). During the past 25 years, federal funding has become less certain. The TRB National Cooperative Highway Research Program's pre-publication draft of  NCHRP Research Report 1004: Federal Funding ...


    Guidelines for Treatments to Mitigate Opposite Direction Crashes
    5/16/2022 1:00:58 PM
    From 2016 through 2018, there were more than 19,200 vehicles in the United States involved in opposite direction crashes that resulted in a fatality. Approximately 68 percent of these crashes occurred on two-lane roadways. The TRB National Cooperative Highway Research Program's NCHRP Research Report 995: Guidelines for Treatments to Mitigate Opposite Direction Crashes provides state departments of transportation (DOTs) practitioners and other transportation professionals with comprehensive guidelines for...


    Guidebook for Effective Policies and Practices for Managing Surface Transportation Debt
    4/22/2022 3:00:56 PM
    The passage of Dodd-Frank and the COVID-19 pandemic are among the factors that have made the environment for tax-exempt debt issuers increasingly challenging and complex. The TRB National Cooperative Highway Research Program's NCHRP Research Report 990: Guidebook for Effective Policies and Practices for Managing Surface Transportation Debt is designed to help surface transportation agencies improve the development and execution of debt management policies, procedures, and practices. Supplemental to the r...


    Metropolitan Planning Organizations: Strategies for Future Success
    4/1/2022 3:00:41 PM
    While metropolitan planning organizations generally adhere to the same federal laws and guidance, each MPO works within a unique framework of state, environmental, resource, and political contexts. External forces of changing technologies, economics, culture, and demographics are creating a formidable array of challenges for MPOs in the coming years. Over 100 MPOs participated in this project, which included an extensive literature review, surveys, and input sessions (both MPO Roundtables and nationwide ...


    Systematic Approach for Determining Construction Contract Time: A Guidebook
    3/18/2022 4:00:18 PM
    Contract time affects the cost of construction, traffic disruption and public inconvenience, the economic impact of projects to the surrounding areas, and schedule risks. The TRB National Cooperative Highway Research Program's NCHRP Research Report 979: Systematic Approach for Determining Construction Contract Time: A Guidebook provides state departments of transportation guidance for producing consistently credible, reliable, and defensible contract time estimates. Supplemental to the report is NCHRP We...


    Ruggedness of Laboratory Tests for Asphalt Mixture Cracking Resistance
    3/16/2022 12:00:00 PM
    Cracking is a primary distress mode of asphalt pavements that creates the need for their rehabilitation. All types of asphalt pavement cracking—thermal, reflection, fatigue, and topdown— are affected by numerous factors and their interactions. The TRB National Cooperative Highway Research Program's NCHRP Research Report 987: Ruggedness of Laboratory Tests for Asphalt Mixture Cracking Resistance presents the results of ruggedness testing of eight laboratory tests for the cracking resistance of asphalt mix...


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