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., 08/17/2022
E.g., 08/17/2022
Monday, July 20, 2020 - 13:30
Horizontal curves are a common and essential element of the rural highway system, and it is essential to sign and mark them consistently to minimize curve crash risk. Curve signing and marking consists primarily of conducting an engineering study to set the curve advisory speed, posting the advisory speed if necessary, and providing other signs and markings (...
Monday, July 13, 2020 - 13:30
HFSTs are pavement surfacing systems that provide skid-resistant, and deck sealing properties not typically associated with conventional materials. The spot application of a thin layer of durable, high friction aggregates as a topping on specially engineered resin or a polymer binder affords long-lasting traction (as stated by manufacturer information), while...
Monday, July 13, 2020 - 13:30
Chloride infiltration into concrete is the major cause of corrosion induced delamination in steel reinforced bridge decks and repairing delaminated concrete is a major cost factor in bridge deck rehabilitation. The TRB Highway Innovations Deserving Exploratory Analysis Program's Determining Bridge Deck Chloride Quantities Using Ground Penetrating Radar...
Monday, June 15, 2020 - 14:00
This study is comprised of two main analyses: (1) a national analysis that assesses the relationship between the presence and quantity of transitway service with the overall economic strength of US Metropolitan Statistical Areas (MSAs) and (2) a comparative analysis of accessibility to regional employment centers, educational institutions, and workforce...
Monday, June 15, 2020 - 14:00
Much attention has been placed on the role that under-roadway culverts may have in inhibiting upstream fish movement because of altered hydrology and unsuitable conditions for accessing or swimming through the culvert. Other culvert effects related to habitat alterations or disturbance to macroinvertebrate communities have received relatively little attention....
Monday, June 15, 2020 - 14:00
More than 90 percent of the road and highway network in the United States is paved with asphalt concrete. Maintenance and periodic rehabilitation require a continuous supply of aggregates and asphalt binder, both of which are becoming increasingly scarce and expensive. Recycling and reusing these resources can reduce costs and improve sustainability. The most...
Monday, June 15, 2020 - 13:45
The purpose of this study was to determine the effectiveness of enhancing existing isolated underpasses with wildlife fencing. One mile of 8-ft-high wildlife fencing was added to a large bridge underpass and a large box culvert 5 mi apart on Virginia’s I-64. Effectiveness was determined by conducting a 2-year post-fencing camera monitoring study and...
Monday, June 8, 2020 - 14:15
Alternative intersections and interchanges brought major benefits to the United States during the 2008–2018 time period. Given the positive impacts, it stands to reason that similar breakthroughs might be possible at freeway merge and diverge locations. This report describes the outcomes of a project that examined this possibility. The primary tool of...
Monday, June 8, 2020 - 14:15
Alkali—silica reaction (ASR) is a chemical distress mechanism that adversely affects the service life of concrete pavements. Key aspects of the reaction, such as the roles of calcium and aluminum on the structure of the gel and their correlation with swelling properties, have not yet been fully understood owing to the complex reaction mechanism. These...
Monday, June 8, 2020 - 14:15
Connected and automated vehicles (CAVs) will fundamentally change the way people and goods are transported from one place to another. Ensuring the safety of their operation and maintaining a safe transportation network will be paramount for the seamless integration of CAVs on public roads. Primary and secondary research was used in this study to develop an...
Monday, June 1, 2020 - 13:15
The purpose of this document is to provide information for enhancing Active Transportation and Demand Management (ATDM) applications using emerging technologies and data sources. It discusses the emerging technologies and data sources, along with ATDM applications. It provides organizational information and operations and maintenance information for future...
Monday, June 1, 2020 - 13:15
This literature review concerns microplastics from tyre and road wear caused by road traffic. As there is limited knowledge about microplastics in general, and microplastics from road traffic in particular, the Swedish Government commissioned the Swedish National Road and Transport Research Institute (VTI) to, during 2018-2020, develop and disseminate knowledge...

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