TRB’s National Cooperative Highway Research Program (NCHRP) Research Report 888: Development of Roundabout Crash Prediction Models and Methods provides crash prediction models that quantify the expected safety performance of roundabouts for motorized and non-motorized road users. Safety performance factors (SPF) and crash modification factors (CMF) are predictive models that estimate expected crash frequencies. These models are used to identify locations where crash rates are higher than expected, to est...

TRB’s National Cooperative Highway Research Program (NCHRP) Research Report 891: Dedicating Lanes for Priority or Exclusive Use by Connected and Automated Vehicles identifies and evaluates opportunities, constraints, and guiding principles for implementing dedicated lanes for connected and automated vehicles. This report describes conditions amenable to dedicating lanes for users of these vehicles and develops the necessary guidance to deploy them in a safe and efficient manner. This analysis helps ident...

TRB's National Cooperative Highway Research Program (NCHRP) has released a pre-publicaiton, non-edited version of Research Report 902: Benchmarking and Comparative Measurement for Effective Performance Management by Transportation Agencies. The report provides guidance and examples for how transportation agencies can ensure that benchmarking is effectively applied to enhance transportation system performance. Benchmarking—comparison of oneself with peers—has been successfully applied in many fields as a ...

TRB's National Cooperative Highway Research Program (NCHRP) has released a prepublication, non-edited version of Research Report 903: Geotechnical Asset Management for Transportation Agencies, Volume 1: Research Overview and Volume 2: Implementation Manual. Volume 1 provides the methodology behind delivering a manual for implementing geotechnical asset management (GAM) practices within transportation agencies. Volume 2 : Implementation Manual (called the GAM Implementation Manual) and its supplementary f...

TRB's National Cooperative Highway Research Program (NCHRP) has released a prepublication, non-edited version of Research Report 903: Geotechnical Asset Management for Transportation Agencies, Volume 2: Implementation Manual (the "GAM Implementation Manual"). Volume 2 provides guidance for maintaining geotechnical assets including walls, slopes, embankments, and subgrades. This report includes the following supplementary materials: Appendices A-G Presentation on the Geotechnical Asset Management Tool Exc...

TRB’s National Cooperative Highway Research Program (NCHRP) Research Report 900: Guide for the Analysis of Multimodal Corridor Access Management describes operational and safety relationships between access management techniques and the automobile, pedestrian, bicycle, public transit, and truck modes. This report may help assist in the selection of alternative access management techniques based on the safety and operation performance of each affected travel mode.The roadway system must accommodate m...

TRB's National Cooperative Highway Research Program (NCHRP) Research Report 897: Tools to Facilitate Implementation of Effective Metropolitan Freight Transportation Strategies provides transportation practitioners and decision makers with guidance for implementing effective metropolitan freight transportation strategies. The report outlines thirty strategies that are tailored to the specific circumstances that are found in local areas. It also identifies and describes sixteen factors that impact implemen...

TRB’s National Cooperative Highway Research Program (NCHRP) Research Report 895: Simplified Full-Depth Precast Concrete Deck Panel Systems describes new connections between full-depth precast concrete deck panels and beams. These connections are simplified with regard to constructability, inspection during construction, reducing the impact of construction on traffic, and future deck replacement.The new system utilizes clustered shear connectors spaced up to six feet and connected to the deck system using...

TRB’s National Cooperative Highway Research Program (NCHRP) Research Report 896: Updating Regional Transportation Planning and Modeling Tools to Address Impacts of Connected and Automated Vehicles, Volume 2: Guidance provides detailed information and guidelines for state departments of transportation (DOTs) and metropolitan planning organizations (MPOs) to help update their modeling and forecasting tools. These tools address expected impacts of connected and automated vehicles (CAVs) on transportation su...

TRB's National Cooperative Highway Research Program (NCHRP) Research Report 896: Updating Regional Transportation Planning and Modeling Tools to Address Impacts of Connected and Automated Vehicles, Volume 1: Executive Summary summarizes guidelines to help agencies update their modeling and forecasting tools to address expected impacts of connected and automated vehicles (CAVs) on transportation supply, road capacity, and travel demand components. Under requirements for long-range transportation planning,...