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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., 08/09/2020
E.g., 08/09/2020
Monday, July 20, 2020 - 13:45
Since 2009, when NCHRP's last Security 101 report was released, there have been significant advances in transportation security approaches, including new strategies, programs, and ways of doing business that have increased the security of transportation systems as well as ensured their resiliency. Hazards and threats to the system have also continued...
Monday, July 20, 2020 - 13:45
Dynamic Messaging Signs (DMS) and Rural Intersection Conflict Warning Signs (RICWS) are roadside signs that feature much larger and heavier signs than are typically placed on their respective support systems. The excess weight and size of these signs, in conjunction with their breakaway support systems, introduces vibration problems not seen in the past. The...
Monday, July 20, 2020 - 13:45
Authors of this research developed a traffic simulation model for the downtown San Jose network and evaluated five different street redesign and travel demand combinations. This model aids understanding of network-wide effects of changes in street design for local and regional agencies who are interested in implementing complete streets and/or one-way to two-...
Monday, July 20, 2020 - 13:45
Public transit systems serving rural areas across Greater Minnesota will now be able to measure and demonstrate their value in actual dollars, thanks to new research that resulted in a method for calculating the benefits these transit services provide. In every case study they reviewed, researchers discovered that the benefits of public transit outweighed the...
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...

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