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...

TRB’s Transportation Research Record: Journal of the Transportation Research Board, No. 2510, explores 11 papers related to geology and properties of earth materials in the transportation sector, including: Assessment of Retaining Wall Inventories for Geotechnical Asset Management Rock Slopes Asset Management: Selecting the Optimal Three-Dimensional Remote Sensing Technology Historical Analysis...

TRB’s National Cooperative Highway Research Program (NCHRP) Innovations Deserving Exploratory Analysis (IDEA) program Report 149: Use of Energy Absorbing Breakaway Posts for W-Beam Guardrail in Frozen Soil Conditions has released a report that develops, tests, and demonstrates the application of breakaway posts with energy absorbing capabilities to enhance the safety performance of W-beam guard...

TRB’s Transportation Research Record: Journal of the Transportation Research Board, No. 2509 consists of six papers that explore the issue of geomaterials, including: Characterization and Stabilization of Quarry Byproducts for Sustainable Pavement Applications Design of Sustainable High-Volume Pavements Using Controlled Low-Strength Material from Native Soil Asphalt Concrete Field Compactibilit...

TRB’s Transportation Research Record (TRR): Journal of the Transportation Research Board, No. 2511 consists of 13 papers with the following titles: Comparison of Methodologies for Establishing Design Properties of Horizontal Drainage in Soft Cohesive Soils Instrumented Mechanically Stabilized Earth Wall Reinforced with Polyester Straps Analysis of Pile-Supported Embankments That Considers Compa...

TRB’s National Cooperative Highway Research Program (NCHRP) latest Impacts on Practice explores how NCHRP’s Innovations Deserving Exploratory Analysis (IDEA) program has helped finance promising but unproven ideas in transportation engineering.

TRB’s Transportation Research Record: Journal of the Transportation Research Board, No. 2473 consists of 28 papers covering the following topics relating to low volume roads: Markov Chain Modeling of Pavement Surfacing Evaluation of the Use of Magnesium Chloride for Surface Stabilization and Dust Control on Unpaved Roads Recommendations for Seal Treatment Rejuvenation Specifications Based on Be...

TRB’s Transportation Research Record: Journal of the Transportation Research Board, No. 2472 consists of 26 papers covering the following topics relating to low volume roads: Automated Extraction of Horizontal Curve Information for Low-Volume Roads Best Management Practices for Low-Volume Forest Roads in the Piedmont Region: Summary and Implications of Research Can Traffic Signs Be Too Bright o...

TRB E-Circular 199: Geotechnical Research Deployment explores how transportation organizations are implementing geotechnical research using new technologies, practices, and policies with the aim of developing and institutionalizing performance standards. The circular summarizes presentations from the 93rd Annual Meeting of the Transportation Research Board, which took place on January 14, 2014 ...

TRB’s second Strategic Highway Research Program (SHRP 2) Report S2-R01C-RW-1: Innovations to Locate Stacked or Deep Utilities documents research and tested tools that could be used to help locate buried utilities or utility systems in highway construction projects. SHRP 2 Renewal Projects R01B and R01C developed a  report  about the testing of the geophysical tools developed in t...

TRB’s Transportation Research Record (TRR): Journal of the Transportation Research Board, No. 2462 Soil Mechanics 2014 consists of 15 articles that examine the effects of fines content on hydraulic conductivity and shear strength of granular structural backfill; an evaluation of AASHTO default values for pullout friction factor (f*) for steel grid mat reinforcement; strength and creep character...

TRB’s National Cooperative Highway Research Program (NCHRP) Research Results Digest 391: Modulus-Based Construction Specification for Compaction of Earthwork and Unbound Aggregate develops a modulus-based construction specification for acceptance of compacted geomaterials.

TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 467: Visualization of Geotechnical Data for Hazard Mitigation and Disaster Response evaluate the tools and techniques used for mitigating geotechnical hazards and responding to geotechnical disasters such as landslides, rockfalls, settlement, sinkholes, and other events.

TRB’s Transportation Research Record (TRR): Journal of the Transportation Research Board, No. 2433 consists of 15 papers that evaluate cold region applications for in-place inclinometers based on microelectromechanical systems technology; seismic waveform tomography; models for scheduling risk evaluation in subsurface explorations; unknown foundations of bridges subjected to scour; and using fi...

TRB’s National Cooperative Highway Research Program (NCHRP) Report 789: Characterization of Cementitiously Stabilized Layers for Use in Pavement Design and Analysis presents performance-related procedures for characterizing cementitiously stabilized layers for incorporation into mechanistic–empirical pavement analysis methods. Appendices to the report are available online. 

TRB’s second Strategic Highway Research Program (SHRP 2) Report S2-R01B-RW-1: Utility-Locating Technology Development Using Multisensor Platforms documents the development of multisensor technologies and geophysical software as applied in underground utility detection and location. SHRP 2 Renewal Projects R01B and R01C developed a  report  about the testing of the geophysical too...

TRB’s second Strategic Highway Research Program (SHRP 2) S2-C06-RW-4: Manager’s Guide to the Integrated Ecological Framework is designed to provide a basic understanding of the Integrated Ecological Framework (IEF), a nine-step process for integrating ecological and transportation planning. It presents information about the relevant stakeholders and types of expertise needed to help ensure...

TRB’s Transportation Research Record: Journal of the Transportation Research Board, No. 2401 consists of six papers that explore aggregate resistance to breakage, abrasion, and polishing; unbound aggregate base rutting model for mechanistic–empirical pavement design; flexural strength and elastic moduli of cement-stabilized materials; recycled asphalt pavement in base layer; recementation react...