Transportation plays a crucial role before, during and after an emergency. Transportation agencies’ unique role stems from their broad range of capabilities and responsibilities.   NCHRP Web-Only Document 384: Developing an Emergency Management Playbook for State Transportation Agencies , from TRB’s National Cooperative Highway Research Program, helps develop a playbook to support emergency m...

Most asphalt pavement design methodologies assume pavements as monolithic structures composed of multiple layers to transfer the traffic loads on the surface to the bottom layers. However, this assumption is compromised when the pavement layers are not fully bonded. NCHRP Web-Only Document 381: Developing Laboratory Methods and Specification Language to Test Tack Coat Materials , from TRB's Nation...

Recreational travel is a major and growing activity in the United States. Recreation trips to outdoor parklands tend to have different characteristics than trips for other types of recreation, such as entertainment, sporting events, and regular exercise. NCHRP Web-Only Document 380: Accessing America's Great Outdoors: Forecasting Recreational Travel Demand , from TRB's National Cooperative Highway...

System-disrupting events, including those stemming from integrated cyber and physical components, intentional criminal acts, a global pandemic, accidents or unintentional human intervention, and natural causes, have only become more sophisticated since NCHRP Research Report 930: Update of Security 101: A Physical Security and Cybersecurity Primer for Transportation Agencies . NCHRP Web-Only Docume...

Large-scale emergencies and disasters (weather-related and other) may be somewhat rare but are not as rare as they used to be, and are generally increasing in intensity and frequency. How state departments of transportation (DOTs) train and coordinate prior to emergencies makes a big difference in how effectively they respond to an emergency. NCHRP Web-Only Document 378: Emergency Response: Organi...

NCHRP Web-Only Document 376: Rapid Tests and Specification Language for Construction of Asphalt-Treated Cold Recycled Pavements , from TRB's National Cooperative Highway Research Program, provides the results and analysis of field testing conducted to verify the short-pin raveling test (SPRT) and long-pin shear test (LPST) threshold values recommended in NCHRP Research Report 960: Proposed AASHTO ...

The efficient movement of freight is the foundation of our communities and economy. Disruptions to the movement of goods can have substantial economic and quality of life effects. At the same time, public sector planners and officials desire a clearer understanding of how goods movement benefits communities through job creation, tax revenues, and other benefits, while balancing the potential envir...

Since 2018, state departments of transportation (DOTs) have been required to develop risk-based transportation asset management plans (TAMPs) and to update these plans every four years. However, the absence of maintenance cost data in a TAMP prevents agencies from fully capturing the total investment made to preserve and improve highway infrastructure assets. NCHRP Web-Only Document 372: Incorpora...

Technology is at the core of the surface transportation system and is embodied in existing and new scientific knowledge and infrastructure, hardware, and software processes. It is designed to improve performance and cost-effectiveness of infrastructure and the vehicles, systems, and services that utilize the infrastructure. In recent years, a series of rapid advances in key technology areas such a...

Highway agencies use weigh-in-motion (WIM) technology to collect vehicle weight and axle load data on roadways. NCHRP Web-Only Document 370: LTPP Data Analysis: Practical Tools and Procedures to Improve WIM Data Quality , from TRB's National Cooperative Highway Research Program, is a supplemental document to NCHRP Research Report 1070: Tools for Assuring WIM Data Quality: Practical Guide , and pro...

The last decade has seen tremendous growth in resources available to state and local transportation agencies for conducting data-driven safety analysis. NCHRP Web-Only Document 369: Estimating Effectiveness of Safety Treatments in the Absence of Crash Data , from TRB's National Cooperative Highway Research Program, describes the process of developing a guide for using alternative, or surrogate, me...

The determination of the level-of-service (LOS) at signalized intersections is an important activity for decision-making in the allocation of resources for managing public roads, estimating the impact of new developments, and designing signal timing plans. There is a need to develop models of right-turn-on-red (RTOR) volume to permit users of the Highway Capacity Manual methodology to estimate the...

NCHRP Web-Only Document 367: Postwar Commercial Properties and Section 106: Piloting the Methodology for Evaluating Historic Significance , from TRB's National Cooperative Highway Research Program, provides a guide for practitioners to better understand how to evaluate post-World War II commercial properties for National Register of Historic Places eligibility for transportation projects in compli...

To effectively manage the condition and performance of transportation infrastructure, state transportation agencies must assess and manage risks to transportation assets. NCHRP Web-Only Document 366: Risk Assessment Techniques for Transportation Asset Management: Appendices , from TRB's National Cooperative Highway Research Program, presents the risk management resources summarized in NCHRP Resear...

Highway infrastructure assets are designed and built to serve long, useful lives. These assets undergo structural aging and degradation driven by traffic and environmental factors, natural and human hazards, and changes in demand and functional use. NCHRP Web-Only Document 365: Implementation of Life-Cycle Planning Analysis in a Transportation AssetManagement Framework , from TRB's National Cooper...

As state departments of transportation seek efficiencies to better manage their infrastructure, a boom in wireless and sensing technology options has presented itself. However, the capabilities of the technologies can be misunderstood, which leads to costly implementation efforts that may not leverage the full potential of such technologies. NCHRP Web-Only Document 364: Applications of RFID and Wi...

Cold In-place Recycling (CIR) and Cold Central Plant Recycling (CCPR) are two paving techniques that are experiencing increased use as agencies strive to find cost effective, sustainable solutions to rebuild the national roadway infrastructure without compromising performance. The TRB National Cooperative Highway Research Program's NCHRP Web-Only Document 363: Construction Guidelines for Cold Cent...

Transportation agencies can make a difference for imperiled pollinators by managing existing roadside vegetation and designing new revegetation plantings with habitat needs in mind. This can generate public support for agencies and help to mitigate the negative ecological effects of roads. NCHRP Web-Only Document 362: Pollinator Habitat Conservation Along Roadways, Volume 11: Northeast , from TRB'...

Transportation agencies can make a difference for imperiled pollinators by managing existing roadside vegetation and designing new revegetation plantings with habitat needs in mind. This can generate public support for agencies and help to mitigate the negative ecological effects of roads. NCHRP Web-Only Document 362: Pollinator Habitat Conservation Along Roadways, Volume 7: Inland Northwest , fro...

Transportation agencies can make a difference for imperiled pollinators by managing existing roadside vegetation and designing new revegetation plantings with habitat needs in mind. This can generate public support for agencies and help to mitigate the negative ecological effects of roads. NCHRP Web-Only Document 362: Pollinator Habitat Conservation Along Roadways, Volume 12: Northern Plains , fro...