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., 03/28/2024
E.g., 03/28/2024
Monday, February 12, 2024 - 15:15
In the past few years, the Systemic Road Safety (SRS) process was introduced by the Federal Highway Administration (FHWA) to address some of the limitations of network screening based on the collision history of specific sites in a road network. The SRS process also considers the site's collision risk factors. Risk factors are those characteristics common...
Monday, February 12, 2024 - 15:15
When, where, and how autonomous shuttles are deployed can have significant safety, economic, and policy impacts on their operation and performance. This research analyzes data related to 120 existing deployments of autonomous shuttles, looking at safety, operational, economic, and policy-related issues. Analysis shows that autonomous shuttles would be an...
Monday, February 12, 2024 - 15:15
The objective of this study was to evaluate the safety impacts of increasing the speed limit from 55 mph to 60 mph on two-lane, two-way state highway road segments in Minnesota. An empirical Bayes (EB) before-after analysis was used to estimate crash modification factors (CMFs) for both segments and intersections. The segment analysis showed an 8 percent...
Monday, February 12, 2024 - 15:15
This evaluation determined the change in crash frequency, type or severity associated with longitudinal sinusoidal rumble strips on rural two-lane undivided Minnesota roadways constructed between 2018 and 2022. Crash modification factors (CMFs) were estimated using cross-sectional analysis to compare crash experience of locations with sinusoidal rumble strips (...
Monday, February 12, 2024 - 15:00
As states and localities adopt a vision of zero traffic fatalities, greater attention is being given to communication, collaboration, leveraging resources, and applying a systemic approach to traffic safety which requires a change in culture among road users and traffic safety agencies. This change in culture is tied to education, engineering, enforcement, and...
Monday, February 5, 2024 - 16:30
Commercial motor vehicle (CMV) safety is a major concern in the United States, including the District of Columbia (DC), where CMVs make up 15% of traffic. This research uses a comprehensive approach, combining statistical analysis and machine learning techniques, to investigate the impact of road pavement conditions on CMV accidents. The study integrates...
Monday, February 5, 2024 - 16:30
Lane departure crashes are a leading cause of fatalities and injury crashes on roadways. To solve this problem, innovative marking in the form of contrasted white on concrete sections and orange marking in work zones were evaluated for their safety benefits. A highway safety manual approach was taken to evaluate the crash reduction benefits from each marking...
Monday, February 5, 2024 - 16:30
Portland Cement Concrete (PCC) is the most widely used construction material due to its versatility, durability, and economy (Mindess et al. 2003). However, PCC is also a quasi-brittle material that has low tensile strength and ductility, as well as weak resistance to the propagation of cracks. Also, problems related to shrinkage, durability and workability...
Monday, January 8, 2024 - 15:30
There are over 590,000 bridges dispersed across the roadway network that stretches across the United States alone. Each bridge with a length of 20 feet or greater must be inspected at least once every 24 months, according to the Federal Highway Act (FHWA) of 1968. This research developed an artificial intelligence (AI)-based framework for bridge and road...
Monday, January 8, 2024 - 15:30
Two-lane highways comprise a considerable percentage of the nation’s roads. A critical component required in the design of two-lane highways is the passing sight distance (PSD). In cases where it is inadequate, no-passing zones are established. There are multiple techniques that are employed for measuring the PSD in the field and the Wyoming Department of...
Monday, January 8, 2024 - 15:30
The objective of this research project is to understand factors (especially curb/corner radii) affecting safety at intersections involving right-turning vehicles and pedestrians/bicyclists. A mixed-methods approach was used, combining crash data analysis with analysis of observational video data. For the crash analysis, data were assembled about more than 1,000...
Monday, August 21, 2023 - 17:00
Precipitation-induced landslides pose risks to humans through property damage, disruption of infrastructure, injury, and loss of life. These risks may be altered by climate change, as changes in vegetation cover and associated root cohesion might lead to a change in areas susceptible to landslides. We investigate this possibility through Monte Carlo simulations...

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