TRB's National Cooperative Highway Research Program (NCHRP) and National Cooperative Freight Research Program (NCFRP) have jointly released NCHRP Report 649/NCFRP Report 3: Separation of Vehiclesâ€"CMV-Only Lanes. The report examines major issues and concepts that should be understood in developing new applications of commercial motor vehicle-only (CMV-only) lanes as a potential method for both easing congestion and reducing the number of traffic accidents on highways.
TRB's National Cooperative Highway Research Program (NCHRP) Report 716: Travel Demand Forecasting: Parameters and Techniques provides guidelines on travel demand forecasting procedures and their application for helping to solve common transportation problems.
The report presents a range of approaches that are designed to allow users to determine the level of detail and sophistication in selecting modeling and analysis techniques based on their situations. The report addresses techniques, optional use of default parameters, and includes references to other more sophisticated techniqu
TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 431: Practices to Manage Traffic Sign Retroreflectivity includes examples of practices that illustrate how different types of transportation agencies might meet federal retroreflectivity requirements for traffic signs.
TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 432: Recent Roadway Geometric Design Research for Improved Safety and Operations reviews and summarizes roadway geometric design literature completed and published from 2001 through early 2011, particularly research that identified impacts on safety and operations.
The report is structured to correspond to chapters in the American Association of State Highway and Transportation Officials' A Policy on Geometric Design of Highways and Streets, more commonly referred to as the Green Book.
NCHRP Synthesis 4
TRB's second Strategic Highway Research Program (SHRP 2) Report S2-C08-RR-1: Linking Community Visioning and Highway Capacity Planning explores community visioning efforts, identifies steps and activities that might be considered when engaging in visioning, and highlights the links between vision outcomes and transportation planning and project development processes.
The report also presents a modelâ€"the Vision Guideâ€"that is a blueprint for preparing, creating, and implementing a visioning process. As part of the project that produced Report S2-C08-RR-1, a companion web tool was
TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 428: Practices and Procedures for Site-Specific Evaluations of Earthquake Ground Motions identifies and describes current practice and available methods for evaluating the influence of local ground conditions on earthquake design ground motions on a site-specific basis.
The report focuses on evaluating the response of soil deposits to strong ground shaking.
TRB's National Cooperative Highway Research Program (NCHRP) Report 712: Optimization of Tack Coat for HMA Placement presents proposed test methods for measuring the quality and performance characteristics of tack coat in the laboratory and the field, and includes a training manual presenting proposed construction and testing procedures for tack coat materials.
Links to appendixes B and D to NCHRP Report 712, which are available only in electronic format, are below:
â€¢ Appendix B: A[more]
TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 425: Waterproofing Membranes for Concrete Bridge Decks documents information on materials, specification requirements, design details, application methods, system performance, and costs of waterproofing membranes used on new and existing bridge decks since 1995.
The synthesis focuses on North American practices with some information provided about systems used in Europe and Asia.
NCHRP Synthesis 425 is an update to NCHRP Synthe[more]
TRB's National Cooperative Highway Research Program (NCHRP) Report 693: Attracting, Recruiting, and Retaining Skilled Staff for Transportation System Operations and Management provides guidance designed to help transportation agencies recruit and retain qualified professional staff in the systems operation and management (SOM) area.
The report explores SOM career paths, skill requirements, and training needs and identifies successful programs, state-of-the-art initiatives, and best industry practices.
A set of tables showing SOM job categories, number of positions, and ed
TRB's second Strategic Highway Research Program (SHRP 2) Report S2-L06-RR-1: Institutional Architectures to Improve Systems Operations and Management examines a large number of topics concerning organizational and institutional approaches that might help transportation agencies enhance highway operations and travel time reliability.
The same project that produced SHRP 2 Report S2-L06-RR-1 also produced SHRP 2 Report S2-L06-RR-2: Guide to Improving Capability for Systems Operations and Management.