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TAC Research Bulletin

The TAC Research Bulletin highlights recently-published reports and articles from around the world with relevance to road transportation in Canada. Full text links are included, so you get more than just the abstract.

E.g., 03/26/2017
E.g., 03/26/2017
Monday, March 13, 2017 - 20:45
This paper investigates the trends of longitudinal and transverse cracking in jointed concrete pavements based on Long-Term Pavement Performance (LTPP) Program Strategic Study of Structural Factors for Rigid Pavements (SPS-2) data. The impacts of slab properties, base type, traffic volume, and environmental factors on the occurrence and extent of longitudinal...
Monday, March 13, 2017 - 20:45
Center line rumble strips (CLRSs) and shoulder rumble strips (SRSs) are proven countermeasures for reducing roadway departure crashes, including head-on and run-off-road crashes. The objectives of this project were twofold. The first objective was to develop a rumble strip decision support guide to inform agencies on CLRS and SRS installation. The second...
Monday, March 13, 2017 - 20:45
This report describes the efforts undertaken to review the status of falling weight deflectometer (FWD) equipment, data collection, analysis, and interpretation, including dynamic backcalculation, as they relate to the models and procedures incorporated in the Mechanistic-Empirical Pavement Design Guide. The full report is available from the FHWA web site at...
Monday, March 13, 2017 - 20:45
Snow and ice control operations are a vital function often conducted by state and local transportation agencies. Many states are choosing to contract snow and ice response services, instead of or in addition to the use of in-­house forces, to maintain lean departments and avoid the equipment responsibilities. This has been a common practice for years, at...
Thursday, March 9, 2017 - 18:00
Automated vehicles are gradually entering our roadway system. Before our roads will be solely used by fully automated vehicles, a long transition period is to be expected in which fully automated vehicles, partly automated vehicles and manually-driven vehicles have to share our roads. The current report looked into the position of pedestrians and cyclists in...
Friday, March 3, 2017 - 16:15
Increasing travel demands and an aging highway infrastructure drive the need for extensive construction, maintenance, and utility work zones. The introduction of work zone environments creates risks for both drivers and construction workers due to changes from the normal driving environment. Temporary speed limit reductions are a common countermeasure aimed at...
Friday, March 3, 2017 - 16:15
The bump at the end of the bridge has long been studied for highways and railways, yet experts from across the transportation industry continue to identify it as one of the most prevalent substructure factors affecting bridge performance. Often, rideability is a subjective measurement used by transportation departments to define the presence of a bump. User...
Friday, March 3, 2017 - 16:00
TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 505: Current Practices and Guidelines for the Reuse of Bridge Foundations provides guidance on reusing bridge foundations, a sustainable option for many bridge replacement and rehabilitation efforts that can result in time and cost savings as well as reduced mobility impacts and...
Friday, March 3, 2017 - 16:00
This paper presents a risk-based approach for classifying the road surface conditions of a highway network under winter weather events. A relative risk index (RRI) is developed to capture the effect of adverse weather conditions on the collision risk of a highway in reference to the normal driving conditions. Based on this index, multiple risk factors related...
Thursday, November 10, 2016 - 19:30
Advances in vehicle automation and communication can dramatically reduce the economic and comprehensive costs of U.S. crashes. This report quantifies in detail the crash-related gains of various vehicle automation and connectivity features and anticipates their near-term and long-range impacts on car crashes in Texas. It also documents the best practices for...
Thursday, November 10, 2016 - 19:30
For highways located in different counties and cities across the country, specific conditions of weather, terrain, traffic characteristics, highway conditions, population and economic development are all different. Driving environments, traffic accidents and injury risks have strong interactions, which have not been fully explored. To effectively mitigate...
Thursday, November 10, 2016 - 19:30
This Austroads report describes a two-year study designed to quantify the immediate and longer-term maintenance impact of grader blading and surface re-sheeting on unsealed roads. The project assembled and analysed roughness data collected by Cassowary Coast Regional Council in Queensland, Blayney Shire Council in New South Wales and Moorabool Shire...

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