TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 519: The Renewal of Stormwater Systems Using Trenchless Technologies summarizes technologies used for the renewal of stormwater systems, including new, emerging, and underutilized trenchless methods, and identifies future research needs. Both trenchless replacement and trenchless renewal methods can reduce negative impacts as...

TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 515: Practices for Preventing Roadway Departures identifies and summarizes practices being used by state departments of transportation (DOTs) to prevent roadway departure crashes and to identify the data-driven advantages and disadvantages of these practices. More than half of all traffic fatalities result from roadway depart...

To keep pace with accelerating rate of research distribution, the Transportation Research Record: Journal of the Transportation Research Board is now publishing articles as soon as they are finalized. The latest papers to be published are as follows: Use of a Laser Diffractometer to Obtain the Particle Size Distribution of Fine-Grained Soils Interstate Speed Profiles Conditioning and Testing Pr...

TR Circular E-C230: Culverts and Soil–Structure Interaction: Fifty Years of Change and a Twenty-Year Projection summarizes the presentations from the TRB 93rd Annual Meeting on January 14, 2014 in Washington, D.C. In the past 40 to 50 years have seen significant changes in the pipe industry in terms of materials used, structure sizes, shapes, and joint capabilities. Design methodologies ha...

The full edition of the July–August 2017  TR News  magazine is now available.  Moving research into practice is the theme of feature articles in this edition. Authors describe today’s successes, present a systematic approach that has proved effective at a state department of transportation, describe federal programs encouraging innovations at the state level, discuss initiatives ...

TRB’s Transportation Research Record: Journal of the Transportation Research Board, No. 2657 consists of 11 papers that explore geotechnical engineering, including: Long-Term Durability Studies on Chemically Treated Reclaimed Asphalt Pavement Material as a Base Layer for Pavements Effect of Microbial-Induced Calcite Precipitation on Surface Erosion and Scour of Granular Soils: Proof of Concept ...

The full edition of the May-June 2017 TR News is now available. This edition explores the role of transportation in economic development. Articles feature information about benefit-cost analysis, freight production models, transportation satellite accounts, and right sizing strategies. The TR News is TRB's bimonthly magazine featuring timely articles on innovative and state-of-the-art research ...

TRB's National Cooperative Highway Research Program (NCHRP) Innovations Deserving Exploratory Analysis (IDEA) has released Final Report 181: Development of Small Specimen Geometry for Asphalt Mixture Performance Testing. The use of small specimen geometries in Asphalt Mixture Performance Tester (AMPT) offer a means to measure as-built pavement layers. Small specimen geometries may improve the e...

A featured article in the May-June 2017 issue of the TR News examines how to develop appropriate evaluation frameworks that account for the integration of new technologies into the infrastructure in order to accurately value the current highway system. The TR News is TRB's bimonthly magazine featuring timely articles on innovative and state-of-the-art research and practice in all modes of trans...

TRB's National Cooperative Highway Research Program (NCHRP) latest Research Topic Highlights explores Bank Erosion and Bridge Scour. It summarizes the results of several research projects to better quantify and model the mechanisms of bridge scour. Included are summaries of bank erosion and countermeasures, bridge scour countermeasures, predictive equations for scour, and special cases involvin...

TRB's National Cooperative Highway Research Program (NCHRP) Web-Only Document 235: Quantifying the Influence of Geosynthetics on Pavement Performance develops a methodology for quantifying the influence of geosynthetics on pavement performance for use in pavement design and analysis. This project focused on the use of geosynthetics in unbound base/subbase layers or as a base/subgrade interface ...

TRB’s Transportation Research Record: Journal of the Transportation Research Board, No. 2656 consists of 8 papers that explore geological engineering, including: Comparison of California Bearing Ratio and Pin Puncture Strength Testing Used in the Evaluation of Geotextiles Coupled Thermo-Hydro-Mechanical Analysis of Freeze–Thaw Behavior of Pavement Structure over a Box Culvert Jump-Starting a Ge...

TRB has released its requirements for submitting papers for presentation at the 2018 TRB Annual Meeting and/or publication in the Transportation Research Record: Journal of the Transportation Research Board . This guide covers the organization and formatting of manuscripts for peer review and for publication, as well as instructions for submission. Papers that do not follow the guidelines will ...

The latest of TRB's National Cooperative Highway Research Program (NCHRP) Ready Results examines NCHRP Research Results Digest 391 : Modulus-Based Construction Specification for Compaction of Earthwork and Unbound Aggregate. Proper compaction of roadway base and subbase is vital to ensure good pavement performance throughout its life span. Modulus, a measure of stiffness, predicts the performan...

TRB’s Transportation Research Record: Journal of the Transportation Research Board, No. 2655 consists of 10 papers that explore geological engineering, including: Evaluating Constructed Aggregate Layers of Working Platforms and Flexible Pavements: Adequacy of In-Place Quality Control and Quality Assurance Techniques Results of Soaked and Unsoaked California Bearing Rate Tests on Unbound Aggrega...

A featured article in the March-April 2017 issue of the TR News highlights photos from the 96th TRB Annual Meeting, January 8-12, 2017. The article features photographs of sessions, workshops, committee meetings, and awards. Bruce M. Smith, Apperson Crump PLC, and General Counsel, Memphis Area Transit Authority, delivered the delivered the 2017 Thomas B. Deen Distinguished Lecture on “Ethical I...

A featured article in the March-April 2017 issue of the TR News highlights photos from the 96th TRB Annual Meeting, January 8-12, 2017. The article features photographs of sessions, workshops, committee meetings, and awards. Bruce M. Smith, Apperson Crump PLC, and General Counsel, Memphis Area Transit Authority, delivered the delivered the 2017 Thomas B. Deen Distinguished Lecture on “Ethical I...

TRB's National Cooperative Freight Research Program (NCFRP) Research Report 37: Using Commodity Flow Survey Microdata and Other Establishment Data to Estimate the Generation of Freight, Freight Trips, and Service Trips: Guidebook provides policy makers with improved establishment-level models that estimate the Freight Trip Generation (FTG), the number of vehicle trips produced and attracted at ...

A featured article in the November-December 2016 issue of the TR News highlights the challenges of freight transportation with regards to meeting new emissions standards. The TR News is TRB's bimonthly magazine featuring timely articles on innovative and state-of-the-art research and practice in all modes of transportation. It also includes brief news items of interest to the transportation com...

TRB’s Transportation Research Record: Journal of the Transportation Research Board, No. 2578 consists of 10 papers that explore geological engineering, including: Pavement Working Platforms Constructed with Large-Size Unconventional Aggregates Optimizing Stability and Stiffness Through Aggregate Base Gradation Influence of Unbound Material Type and Input Level on Pavement Performance Using Mech...

TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 495: Use of Reclaimed Asphalt Pavement and Recycled Asphalt Shingles in Asphalt Mixtures summarizes current practices for the use of reclaimed asphalt pavement (RAP) and recycled asphalt shingles (RAS) in the design, production, and construction of asphalt mixtures. It focuses on collecting information about the use, rather t...

TRB’s Transportation Research Record: Journal of the Transportation Research Board, No. 2579 consists of 10 papers that explore geotechnical engineering issues, including: Effect of Aggregate Uniformity on Pullout Resistance of Steel Strip Reinforcement Framework for Defining Asset Features to Monitor and Assess Earth-Retaining Structures Developing a Model to Estimate Pile Setup for Individual...

TRB's Transportation Research Record: Journal of the Transportation Research Board, No. 2580 consists of 10 papers addressing geological, geoenvironmental, and geotechnical engineering issues, including: Soil–Cement Laboratory Mixture Design That Interfaces with Pavement Design and Construction Quality Control Cement-Treated Bases Containing Reclaimed Asphalt Pavement, Quarry By-Products, and F...

TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 496: Minimizing Roadway Embankment Damage from Flooding documents the state-of-the-practice on how the transportation community is protecting roadways and mitigating damage from inundation and overtopping. This report highlights major issues and design components specific to roadway embankment damage from flooding. It documen...

TRB's Innovations Deserving Exploratory Analysis (IDEA) Highway Project 172: Bidirectional-Ductile End Diaphragms for Seismic Performance and Substructure Protection explores the applications of ductile diaphragms for use as a seismic-resistance solution for short and medium span steel bridges in all seismic regions. The research focused on applications for new bridge design, but the informatio...

TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 492: Performance Specifications for Asphalt Mixtures documents the performance tests used in conjunction with volumetric properties for mixtures. Performance tests are intended to extend service life by guiding material selection and proportions. The synthesis provides examples of engineering tools used in the development and...

A featured article in the March-April 2016 issue of the TR News highlights photos from the 95th TRB Annual Meeting, January 10-14, 2016. The article features photographs of sessions, workshops, committee meetings, and awards. Dr. Hani Mahmassani, William A. Patterson Distinguished Chair in Transportation and professor, Northwestern University, and Director, Northwestern University Transportatio...

TRB's National Cooperative Highway Research Program (NCHRP) Report 823: Guidelines for Certification and Management of Flexible Rockfall Protection Systems provides advice on rockfall fence systems for transportation agencies. It also outlines data that are needed to evaluate the results of rockfall fence systems tested using the procedure recommended for acceptance. Finally, the report present...

TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 484: Influence of Geotechnical Investigation and Subsurface Conditions on Claims, Change Orders, and Overruns documents the extent and type of claims, change orders, and cost overruns from subsurface conditions for state departments of transportation (DOTs). The report also identifies practices used by agencies to reduce such...

TRB's Rockfall: Characterization and Control addresses rockfall hazard identification and evaluation, investigation process, mitigation options, and maintenance and management programs. A recent survey of readers indicates that the publication has demonstrated usefulness in the field.  The 600-plus page publication includes a DVD with video clips of rockfall field tests and several histori...