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, January 25, 2021 - 15:15
Automated driving systems (ADS) have the potential to fundamentally change transportation, and a growing number of these systems have entered the market and are currently in use on public roadways. However, drivers may not use ADS as intended due to misunderstandings about system capabilities and limitations. Moreover, the real-world use and effects of this...
Monday, January 25, 2021 - 15:15
Compaction is one of the most important factors that affects the durability of asphalt pavements. Many studies have been focused on developing methods to improve compaction. Previously, the authors found that the addition of small percentages of Graphite Nanoplatelets (GNPs) significantly increase the compactability of asphalt mixture. Traditional viscosity...
Monday, January 18, 2021 - 20:30
The main goal of this project was to identify focus crash and facility types (FCFTs) and associated contributing factors to better inform applications of systemic safety improvements. The selection of FCFTs was guided by the use of the Fatality Analysis Reporting System and the Highway Safety Information System (HSIS) databases (NHTSA 2018a; FHWA 2018c). The...
Monday, January 18, 2021 - 20:15
This document serves as a quick reference guide for transportation professionals in State and local agencies that are interested in applying a systemic approach to road-safety management. This guide provides brief overviews of the systemic approach, common target crash types and their associated facility types, and contributing factors. It also provides a six-...
Monday, January 18, 2021 - 20:15
The transportation-engineering community is transforming by integrating quantitative methods into the task development process. This report identifies opportunities to better understand the relationships between road safety and factors that affect traffic-crash occurrence and severity. In this report, current statistical-analysis methods and data sources used...
Monday, January 18, 2021 - 20:00
This project established protocols to help evaluate the utilization of chemical stabilization methods to potentially improve the engineering behavior of problematic soils with and without soluble sulfates within the state of Montana. In addition, construction life cycle cost analyses were used to compare existing approaches used by MDT versus chemical...
Monday, January 18, 2021 - 20:00
Nineteen state highway locations around south-central and southwestern Minnesota were evaluated during winter 2019-20 for the application of deicer “hot shots,” extra levels of salt or other chemical treatments used to deice roadways and maintain roadway driving levels of performance. Locations were selected based on previous recordkeeping that...
Monday, January 18, 2021 - 19:45
The density and air void content of asphalt mixtures affect the durability and performance of asphalt pavements. Pavement longitudinal joints typically have a lower density than the mat because they receive less compaction than the center section of the mat for various reasons. The higher air void percentages resulting from lower densities can lead to high...
Monday, January 18, 2021 - 19:45
This report was largely prepared in 2019 and early 2020 before the novel coronavirus  that  causes  COVID-19  struck  the  United  States.  Economic  shutdowns and social distancing measures were put in place in multiple cities  and  states  beginning  in  March  2020  to ...
Monday, January 18, 2021 - 19:45
This report explores the accessibility challenges that people face in remote areas. It demonstrates how state support can ensure access to essential services and reduce social and economic isolation where private markets fail to provide adequate transport connections. It provides a classification of policy interventions in different countries and reviews common...
Monday, January 11, 2021 - 16:00
Management of traffic signal systems is a critical function for many transportation agencies. Thanks to advancements in technology, it is now possible to collect large amounts of data at signalized intersections, leading to the development of dozens of performance measures. The TRB National Cooperative Highway Research Program's NCHRP Research Report...
Monday, January 11, 2021 - 15:45
Using reclaimed asphalt pavement (RAP) has grown significantly since the oil embargo of the 1970s. The National Asphalt Pavement Association reported that over 71 million tons of RAP were used in 2014 (NAPA 2015). RAP was traditionally used in warm-mix asphalt (WMA) and hot-mix asphalt (HMA) construction, including conventional and thin HMA overlays, but there...

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