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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., 03/26/2019
E.g., 03/26/2019
Wednesday, January 2, 2019 - 19:30
Transportation Systems Management and Operations (TSMO) presents a key opportunity for transportation agencies today and many agencies have recently been making a significant effort to better leverage TSMO to improve system performance in a cost effective way. This guide explores how a transportation agency's established Institutional, Organizational, and...
Wednesday, January 2, 2019 - 19:30
This TRB report provides transportation practitioners and decision makers with guidance for implementing effective metropolitan freight transportation strategies. The report outlines thirty strategies that are tailored to the specific circumstances that are found in local areas. It also identifies and describes sixteen factors that impact implementation. ...
Wednesday, January 2, 2019 - 19:30
Prefabricated bridge elements and systems (PBES) are integral to many accelerated bridge construction projects, and prefabricated deck panels are one of many PBES types that have gained popularity in such projects. Laboratory research and field studies have indicated the primary challenge for these systems is the design and construction of the connections,...
Wednesday, November 28, 2018 - 16:45
This document aims to support cities in setting road safety targets and to monitor progress in improving urban road safety. Pedestrians, cyclists and motorcyclists account for nearly 80% of urban traffic fatalities. Cities should thus intensify efforts to improve the safety of vulnerable road users. This document presents traffic safety indicators for different...
Wednesday, November 28, 2018 - 16:30
The impact of quiet electric cars, listening to music and conversing on the phone on cyclists’ auditory perception and cycling safety Cycling safety is a major traffic safety issue both in the Netherlands and abroad. The number of cyclist fatalities in the EU has been decreasing in recent years, however at a slower rate than those of car occupants or...
Wednesday, November 28, 2018 - 16:30
To better understand the emerging area of low-speed automated shuttles, the U.S. Department of Transportation (USDOT) Intelligent Transportation Systems Joint Program Office (ITS JPO) partnered with the John A. Volpe National Transportation Systems Center (Volpe) to review the current state of the practice of low-speed automated shuttles. These vehicles share...
Wednesday, November 28, 2018 - 16:30
The objective of the study was to evaluate the safety effects of two countermeasures with respect to vehicle–pedestrian crashes—the provision of protected or protected/permissive left-turn phasing and the provision of leading pedestrian intervals (LPIs)—using a before–after empirical Bayesian methodology. The study used data from North...
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...

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