 Recent Roadway Geometric Design Research for Improved Safety and OperationsApril 19, 2012 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 th...
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 Practices to Manage Traffic Sign RetroreflectivityApril 27, 2012 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.
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 Geotechnical Information Practices in Design-Build ProjectsMay 14, 2012 TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 429: Geotechnical Information Practices in Design-Build Projects addresses how states use geotechnical information in solicitation documents and contracts for design-build highway projects. The report examines current practices regarding the allocation of geotechnical risk and the level of geotechnical information provided wi...
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 Practices and Procedures for Site-Specific Evaluations of Earthquake Ground MotionsApril 17, 2012 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 de...
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 Extent of Highway Capacity Manual Use in PlanningApril 11, 2012 TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 427: Extent of Highway Capacity Manual Use in Planning assesses how state departments of transportation, small and large metropolitan planning organizations, and local governments are using or might use the Highway Capacity Manual for planning analyses, or more specifically, for performance monitoring, problem identification,...
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 Waterproofing Membranes for Concrete Bridge DecksMarch 30, 2012 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 info...
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 Engineering Economic Analysis Practices for Highway InvestmentMay 10, 2012 TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 424: Engineering Economic Analysis Practices for Highway Investment explores how U.S. transportation agencies have applied engineering economics--benefit–cost analyses and similar procedures--to decisions on highway investments.
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 Long-Term Performance of Polymer Concrete for Bridge DecksJanuary 20, 2012 TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 423: Long-Term Performance of Polymer Concrete for Bridge Decks addresses a number of topics related to thin polymer overlays (TPOs). Those topics include previous research, specifications, and procedures on TPOs; performance of TPOs based on field applications; the primary factors that influence TPO performance; current cons...
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 Trade-Off Considerations in Highway Geometric DesignOctober 17, 2011 TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 422: Trade-Off Considerations in Highway Geometric Design describes the processes that transportation agencies currently use to evaluate geometric design trade-offs between competing interests. The report also highlights existing key publications on conventional approaches, context-sensitive solutions/context-sensitive design...
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 Recycling and Reclamation of Asphalt Pavements Using In-Place MethodsSeptember 1, 2011 TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 421: Recycling and Reclamation of Asphalt Pavements Using In-Place Methods discusses the use of hot in-place recycling, cold in-place recycling, and full-depth reclamation of asphalt pavements. In-place recycling and reclamation of asphalt pavements provides agencies with the ability to optimize the value of in-place material...
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 Operational and Institutional Agreements That Facilitate Regional Traffic Signal OperationsOctober 3, 2011 TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 420: Operational and Institutional Agreements That Facilitate Regional Traffic Signal Operations (RTSOPs) identifies and highlights critical attributes of successful RTSOPs across the United States. Regions can use RTSOPs to help improve traffic flow as it crosses from one jurisdiction to another. A central focus of these pro...
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 Transportation Improvement Program Revision ProcessJuly 15, 2011 TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 419: Transportation Improvement Program Revision Process compiles and documents the different ways that metropolitan planning organizations (MPOs) approach revising a Transportation Improvement Program (TIP) once it has been adopted. Federal legislation requires MPOs to adopt and regularly update a TIP identifying a prioritiz...
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 Developing Production Pile Driving Criteria from Test Pile DataAugust 22, 2011 TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 418: Developing Production Pile Driving Criteria from Test Pile Data provides information on the current practices used by state transportation agencies to develop pile driving criteria, with special attention paid to the use of test pile data in the process.
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 Geometric Design Practices for Resurfacing, Restoration, and RehabilitationJuly 13, 2011 TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 417: Geometric Design Practices for Resurfacing, Restoration, and Rehabilitation documents the current state-of-the-practice related to nonfreeway resurfacing, restoration, and rehabilitation projects. Appendix G, Summary of Good Practices: Incorporating Safety into Resurfacing and Restoration Projects, to NCHRP Synthesis 417...
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 Implementing Race-Neutral Measures in State Disadvantaged Business Enterprise ProgramsApril 25, 2011 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 D...
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 Design Fires in Road TunnelsAugust 10, 2011 TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 415: Design Fires in Road Tunnels information on the state of the practice of design fires in road tunnels, focusing on tunnel fire dynamics and the means of fire management for design guidance. Note: On September 20, 2011, the following errata was released related to NCHRP Synthesis 415. The electronic version of...
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 Effective Delivery of Small-Scale Federal-Aid ProjectsMay 16, 2011 TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 414: Effective Delivery of Small-Scale Federal-Aid Projects examines streamlined methods for meeting federal funding requirements for small-scale highway projects. The report explores ways that state departments of transportation work with local agencies to implement small projects eligible for federal funding. Appendix G to ...
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 Techniques for Effective Highway Construction Projects in Congested Urban AreasFebruary 18, 2011 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 watchf...
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 Speed Reduction Techniques for Rural High-to-Low Speed TransitionsApril 20, 2011 TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 412: Speed Reduction Techniques for Rural High-to-Low Speed Transitions explores techniques for lowering traffic speeds in rural transition zones. Transition zones are those portions of high-speed roads that have lower posted speed limits as the roadway approaches a settlement.
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 MicrosurfacingDecember 24, 2010 TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 411: Microsurfacing explores highway microsurfacing project selection, design, contracting, equipment, construction, and performance measurement processes used by transportation agencies in the United States and Canada. Microsurfacing is a polymer-modified cold-mix surface treatment that has the potential to address a broad r... |