TRB's National Cooperative Highway Research Program (NCHRP) Research Report 884: Guidelines for Managing Geotechnical Risks in Design–Build Projects provides guidelines for the implementation of geotechnical risk management measures for design –build project delivery . The guidelines provide five strategies for aligning a transportation agency and its design–builder’s perception of geotechnical risk as well as 25 geotechnical risk management tools that can be used to implement the strategies on typical d...

TRB's National Cooperative Highway Research Program (NCHRP) has released a pre-publication, non-edited version of Research Report 893: Systemic Pedestrian Safety Analysis. This guidebook provides a safety analysis method that can be used to proactively identify sites for potential safety improvements based on specific risk factors for pedestrians. A systemic approach, as opposed to a “hot-spot” approach, enables transportation agencies to identify, prioritize, and select appropriate countermeasures for l...

TRB's National Cooperative Highway Research Program (NCHRP) Research Report 880: Design Guide for Low-Speed Multimodal Roadways provides best practice guidance by referencing a range of acceptable elements, criteria, and values for critical dimensions for design of low- to intermediate-speed roadways with a mix of users. The report assists designers in establishing a balance between operational efficiency, comfort, safety, and convenience for modes on the low- and intermediate-speed roadways. Low to inte...

TRB's National Cooperative Highway Research Program (NCHRP) Research Report 883: Fracture-Critical System Analysis for Steel Bridges presents a proposed specification for the analysis and identification of fracture-critical members and system-redundant members. The report describes the analysis methodology and provides application examples. The analysis methodology is based on comprehensive 3-D finite element analyses (FEA) and case studies to evaluate the redundancy of new and existing steel bridges wit...

TRB's National Cooperative Highway Research Program (NCHRP) Research Report 881: Traffic Control Devices and Measures for Deterring Wrong-Way Movements provides an analysis of factors associated with wrong-way movements on unsignalized divided highways and freeways. The divided highway analysis focuses on design, signage, and roadway markings, while the freeway analysis emphasizes the effectiveness of signage with flashing lights. The results are used to identify appropriate countermeasures and to develo...

TRB's National Cooperative Highway Research Program (NCHRP) Research Report 882: How Weather Affects the Noise You Hear from Highways documents the meteorological effects on roadway noise propagation under different atmospheric conditions. Highway noise changes from day to day and hour to hour—not just because of variations in traffic volumes, vehicle mix, and speed, but also because of the weather. The report develops guidance to identify when atmospheric conditions should or should not be considered in...

TRB's National Cooperative Highway Research Program (NCHRP) has released a pre-publication, non-edited version of Research Report 876: Guidelines for Integrating Safety and Cost-Effectiveness into Resurfacing, Restoration, and Rehabilitation (3R) Projects. The report presents an approach for estimating the cost-effectiveness of including safety and operational improvements in a resurfacing, restoration, or rehabilitation (3R) project. The approach uses the performance of the existing road in estimating t...

TRB's National Cooperative Highway Research Program (NCHRP) Research Report 879: Optimal Replacement Cycles of Highway Operations Equipment acts as a handbook on equipment replacement concepts and an instruction manual for making cost-effective replacement decisions. The research report presents a process for determining replacement needs for highway operations equipment, identifying candidate equipment units for replacement, and preparing an annual equipment replacement program. The products include a g...

TRB's National Cooperative Highway Research Program (NCHRP) Research Report 868: Cell Phone Location Data for Travel Behavior Analysis presents guidelines for transportation planners and travel modelers on how to evaluate the extent to which cell phone location data and associated products accurately depict travel. The report identifies whether and how these extensive data resources can be used to improve understanding of travel characteristics and the ability to model travel patterns and behavior more e...

TRB's National Cooperative Highway Research Program (NCHRP) has released a pre-publication, non-edited version of Research Report 890: Using Recycled Asphalt Shingles with Warm Mix Asphalt Technologies.  The report documents the development of a design and evaluation procedure that provides acceptable performance of asphalt mixtures incorporating warm mix asphalt (WMA) technologies and recycled asphalt shingles (RAS)—with and without recycled asphalt pavement (RAP)—for project-specific service condi...