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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., 10/23/2018
E.g., 10/23/2018
Tuesday, August 14, 2018 - 17:15
Ultra-Thin Bonded Wearing Course (UTBWC) pavement surfacing was introduced to Minnesota in 1999 under the brand name, “NovaChip”. It was developed as a preventative maintenance option to extend pavement life by placing a thin open/gap-graded hot mix asphalt (HMA) lift over a polymer-modified asphalt emulsion. The open/gap-graded aggregate also...
Tuesday, August 14, 2018 - 17:15
The overall objectives of this study were to (1) identify and explore alternative safety data sources and analysis perspectives and (2) demonstrate the potential utility of these alternative approaches in increasing understanding of precipitating events and predisposing factors for crashes occurring on horizontal curves and at unsignalized intersections along...
Tuesday, August 14, 2018 - 17:00
Cycle gates have recently been introduced in London, as a method of separating cycle traffic and general traffic at signal-controlled junctions where a significant proportion of motor vehicles turn left. This report presents the findings of research into road user behaviour and attitudes at two cycle gates on Cycle Superhighways, these being at Queen Street...
Tuesday, July 17, 2018 - 15:30
This report presents corrosion study findings related to corrosion resistance of eight types of metallic dowel bars. The accelerated laboratory corrosion testing was performed using seven small-scale concrete slabs that simulated typical concrete pavements for 452 d of a modified Southern Exposure followed by a detailed autopsy of the extracted bar samples. The...
Tuesday, July 17, 2018 - 15:15
Introduction and adoption of autonomous vehicles (AVs) will likely reshape the transportation system and many economic activities. The economic literature on technology adoption can provide lessons on the diffusion of AVs as well as the social and economic impacts. We rely on the threshold model of diffusion, where heterogeneous agents make decisions to pursue...
Wednesday, June 6, 2018 - 15:45
The new Complete Streets Design and Construction Standards, which govern roadway design in the City of Edmonton replace the 2013 Complete Streets Guidelines. The Complete Streets approach moves away from traditional design by designing streets that reflect the surrounding area’s context, land use and users. A complete street integrates all road users...
Thursday, May 24, 2018 - 18:00
Data is essential for understanding the demands placed on road assets and transport networks. There is an opportunity through advances in real-time technologies to improve the delivery of network management and asset management activities. This requires an understanding of both the real-time technologies that are available, and the real-time information needs...
Thursday, May 24, 2018 - 18:00
This report examines how increasing automation of cars and trucks could affect road safety, and which security vulnerabilities will need to be addressed with the rise of self-driving vehicles. It applies the principles of the Safe System approach and relevance of Vision Zero for road safety to the wider discussion on vehicle automation. It also takes into...
Wednesday, May 9, 2018 - 17:45
This research report presents an improved process for evaluating the benefits and economic tradeoffs associated with a variety of highway preservation projects. It includes a summary of results from a comprehensive phone survey concerning the use and application of the software developed by the Federal Highway Administration (FHWA), known as the Highway...
Wednesday, May 9, 2018 - 17:30
Maintaining effective pavement markings year-round is a challenge in Iowa, where winter maintenance causes so much damage due to the harsh winter exposure from snow plow blades, sand, and salt brine. Given these conditions, and a limited painting season, it is critical that agencies select the proper pavement marking materials for the roadways in their network...
Wednesday, May 9, 2018 - 17:30
In this white paper, the available evidence on the travel and environmental effects of automated vehicles is critically reviewed to understand the potential magnitude and likelihood of estimated effects. We outline the mechanisms by which automated vehicles may change travel demand and review the available evidence on their significance and size. These...
Wednesday, May 9, 2018 - 17:30
Research shows that pothole prevention requires repairing pavement cracks as they develop. Repairing potholes effectively is more difficult in winter than in summer. Durable winter repairs require expensive patching materials and expensive, on-site heating technologies. Taconite mixes and mixtures modified with graphite nanoplatelets show promise for long-...

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