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., 06/30/2022
E.g., 06/30/2022
Monday, June 7, 2021 - 14:45
Local and regional planners struggle to keep up with rapid changes in mobility patterns. This exploratory research is framed with the overarching goal of asking if and how geo-social network data (GSND), in this case, Twitter data, can be used to understand and explain commuting and non-commuting travel patterns. The research project set out to determine...
Monday, June 7, 2021 - 14:45
Several types of speed limits exist, including statutory speed limit, posted speed limit, school zone speed limit, work zone speed limit, variable speed limit, and advisory speed. The TRB National Cooperative Highway Research Program's NCHRP Web-Only Document 291: Development of a Posted Speed Limit Setting Procedure and Tool documents the research efforts...
Monday, May 31, 2021 - 15:15
This document describes the current test tools and capabilities established at NHTSA’s Vehicle Research and Test Center for researching the safety performance of advanced driver assistance systems (ADAS) and automated driving systems (ADS) in a closed-course setting. This paper focuses on immediate and future needs for ADAS and ADS closed-course testing...
Monday, May 17, 2021 - 14:15
This report provides an approach for estimating present serviceability rating (PSR) from measured surface distress data to report overall pavement condition, where permitted, to support implementation of the National Performance Management Measures. The National Performance Management Measures; Assessing Pavement Condition for the National Highway Performance...
Monday, May 17, 2021 - 14:15
Read detailed case studies about connected and automated vehicle and low emission vehicle  trials in Australia and New Zealand. The public we site is available at https://austroads.com.au/drivers-and-vehicles/future-vehicles-and-technology/trials
Monday, May 10, 2021 - 17:00
This report details research undertaken to improve the mechanistic-empirical procedure for pavement rehabilitation and strengthening treatment design included in Austroads Guide to Pavement Technology Part 5: Pavement Evaluation and Treatment Design. The report describes the research needs and provides a comprehensive roadmap for future work. The project...
Monday, April 26, 2021 - 15:00
This project studied the performance of geotextile-reinforced test sections when compared to an unreinforced case to assess benefit in terms of an extension of the life of the pavement. A single test track was constructed in an indoor test facility and contained two test sections with a reinforcement geotextile (woven and non-woven) while the third section was...
Monday, April 12, 2021 - 18:15
This report provides a comprehensive overview of the type, volume, and price of recycled plastics and their possible uses in asphalt. The report presents data, including recycling processes, prices of recycled plastics, annual production volumes and infrastructure capabilities. The content was informed by interviews with members of the plastics industry...
Monday, April 12, 2021 - 18:15
In Texas, and most of the U.S., Class F fly ash is the most used supplementary cementitious material (SCM) due to the many benefits it provides to concrete. In recent years, the availability of Class F fly ash has decreased as many coal-fired power plants have shut down. Plants that have not shut down are required to install various emission control systems...
Monday, April 12, 2021 - 18:15
Bridge load rating assesses the safe live load carrying capacity of an existing or newly designed structure. In addition to load rating with previously defined standard load rating vehicles, the Federal Highway Administration issued additional guidance to states related to rating requirements for all the bridges with respect to specialized hauling vehicles and...
Monday, April 12, 2021 - 18:00
The accurate characterization of the in situ aging of asphalt pavement materials over the service life of the pavement is of utmost importance to the implementation of mechanistic empirical (ME) pavement design and analysis methods. The TRB National Cooperative Highway Research Program's NCHRP Research Report 973: Long-Term Aging of Asphalt Mixtures...
Monday, April 12, 2021 - 18:00
This research note identifies a variety of land transport mode shift programmes that have demonstrated reductions in greenhouse gas emissions (GHG), primarily through changes in vehicle kilometres travelled (VKT). Many interrelated factors influence GHG emissions including the level of active mode or public transport infrastructure, land use planning,...

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