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 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 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.
TRB's National Cooperative Highway Research Program (NCHRP) Legal Research Digest 56: The Ramifications of Post-Kelo Legislation on State Transportation Projects explores the consequences of legislation enacted by state legislatures that limits the use of eminent domain in response to the 2005 United States Supreme Court case of Kelo v. the City of New London, where the Court held that the use of eminent domain to take nonblighted, private property for a city-approved, privately implemented economic development plan was constitutional.
The report examines how state legislation has a
TRB's National Cooperative Highway Research Program (NCHRP) Report 701: Proposed Specifications for LRFD Soil-Nailing Design and Construction contains proposed specifications for the design and construction of soil-nailed retaining structures.
The American Association of State Highway and Transportation Officials (AASHTO) Standard Bridge Specifications, the AASHTO Load and Resistance Factor Design (LRFD) Bridge Design Specifications, and the AASHTO LRFD Bridge Construction Specifications do not include guidance for soil-nailed structures.
In the absence of AASHTO LRFD
TRB's National Cooperative Highway Research Program (NCHRP) Research Results Digest 363: Hydroacoustic Impacts on Fish from Pile Installation explores the prediction and mitigation of the negative impacts on fish from underwater sound pressure during pile and casing installation and removal.
Appendices A through H for RRD 363 are available online.
TRB's National Cooperative Highway Research Program (NCHRP) Report 698: Application of Accelerated Bridge Construction Connections in Moderate-to-High Seismic Regions evaluates the performance of connection details for bridge members in accelerated bridge construction in medium-to-high seismic regions and offers suggestions for further research.
The following appendixes to NCHRP Report 698 were published in electronic format only.
â€¢ Appendix Aâ€"Summary Sheets of Bar Coupler Co
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 materials, minimize construction time and traffic flow disruptions, and reduce the number of construction vehicles moving in and out of the construction area.
TRB's National Cooperative Highway Research Program (NCHRP) RRD 355: Summary of Cast-In-Place Concrete Connections for Precast Deck Systems summarizes the results of a project that developed recommended design and construction specifications and examples for the design and construction of durable cast-in-place reinforced concrete connections for precast deck systems.
The project focused on systems that reduce the need to place and remove formwork, thus accelerating on-site construction and improving safety.
The full report on the project was published as [more]