TRB's National Cooperative Highway Research Program (NCHRP) Report 691: Mix Design Practices for Warm-Mix Asphalt explores a mix design method tailored to the unique material properties of warm mix asphalt technologies.
Warm mix asphalt (WMA) refers to asphalt concrete mixtures that are produced at temperatures approximately 50Â°F (28Â°C) or more cooler than typically used in the production of hot mix asphalt (HMA). The goal of WMA is to produce mixtures with similar strength, durability, and performance characteristics as HMA using substantially reduced production temperatures. [more]
TRB's National Cooperative Highway Research Program (NCHRP) Report 684: Enhancing Internal Trip Capture Estimation for Mixed-Use Developments explores an improved methodology to estimate how many internal trips will be generated in mixed-use developmentsâ€"trips for which both the origin and destination are within the development.
The methodology estimates morning and afternoon peakâ€"period trips to and from six specific land use categories: office, retail, restaurant, residential, cinema, and hotel. The research team analyzed existing data from prior surveys and collected new data
TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 416: Implementing Race-Neutral Measures in State Disadvantaged Business Enterprise Programs explores race-neutral strategies being used effectively by state departments of transportation (DOTs) to meet their Disadvantaged Business Enterprises (DBE) participation goals. It also reviews and synthesizes problems faced by state DOTs in the administration of their DBE programs and identifies race-neutral remedies used to overcome these challenges.
As state DOT's carry out their highway construction programs, they are r
TRB's National Cooperative Highway Research Program (NCHRP) Report 675: LRFD Metal Loss and Service-Life Strength Reduction Factors for Metal-Reinforced Systems explores the development of metal loss models for metal-reinforced systems that are compatible with the American Association of State Highway and Transportation Officials' Load and Resistance Factor Design Bridge Design Specifications.
NCHRP Research Results Digest 364: Validation of LRFD Metal Loss and Service-Life Strength Reduction Factors for Metal-
TRB's Strategic Highway Research Program (SHRP 2) Report S2-S05-RR-1: Design of the In-Vehicle Driving Behavior and Crash Risk Study provides a summary of the key aspects of the planning effort supporting the SHRP 2 Naturalistic Driving Study (NDS). SHRP 2 Safety Project S05: Design of the In-Vehicle Driving Behavior and Crash Risk Study (Study Design) designed the SHRP 2 NDS, which will collect dataâ€"on the order of 1 petabyte (1,000 terabytes)â€"on "naturalistic," or real-world, driving behavior over a two-year period beginning in fall 2010.
The resulting data is expected to prov
TRB's National Cooperative Highway Research Program (NCHRP) Report 686: Road Pricing: Public Perceptions and Program Development explores road pricing concepts and their potential effectiveness and applicability. The report includes guidelines for project planning and integrating pricing into regional and state planning processes, and for communicating strategies and engaging affected parties.
TRB's second Strategic Highway Research Program (SHRP 2) Report S2-R26-RR-2: Guidelines for the Preservation of High-Traffic-Volume Roadways explores the state of the practice for preservation treatments on high- and low-volume asphalt and concrete roadways. The report also includes suggested guidelines on the application of preservation treatments on high-volume roadways.
Errata (October 2011): Table 3.2 (pp. 20-21) contained incorrect information in the following rows; chip seal (single); chip seal (double); and hot in-place recycling. The table has been corrected in the online ve
TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 413: Techniques for Effective Highway Construction Projects in Congested Urban Areas explores a diverse set of techniques designed to address highway construction challenges in congested urban areas such as high-traffic volumes, utility conflicts, complex right-of-way acquisition issues, a diverse stakeholder base, and watchful news media.
The report includes four case studies designed to help illustrate effective construction practices in congested urban areas.
TRB's National Cooperative Highway Research Program (NCHRP) Research Results Digest 350: Continuing Project to Synthesize Information on Highway Problems is a digest of the progress and status of NCHRP Project 20-5, "Synthesis of Information Related to Highway Problems."
TRB's National Cooperative Highway Research Program (NCHRP) Report 674: Crossing Solutions at Roundabouts and Channelized Turn Lanes for Pedestrians with Vision Disabilities explores information related to establishing safe crossings at roundabouts and channelized turn lanes for pedestrians with vision disabilities.
Appendices B through N to NCHRP Report 674 were published as NCHRP Web-Only Document 160. The Appendices included in NCHRP Web-Only Document 160 are as follows:
â€¢ Appendix B: Long Lis