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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., 11/18/2019
E.g., 11/18/2019
Friday, November 15, 2019 - 18:30
The disc-shaped compact tension (DCT) fracture energy test has been shown to discriminate between asphalt mixtures with respect to their thermal cracking potential. This research refines the DCT fracture energy testing procedure, identifies needed adjustments in asphalt mixture to increase fracture energy, determines the suitability of DCT-test-based parameters...
Friday, November 15, 2019 - 18:30
This report presents the results of a research project commissioned by Austroads to investigate whether the currently used Australian general-purpose (GP) cement which complies with AS 3972, and which may contain up to 7.5% limestone as a mineral addition, could be replaced with a cement proposed by the cement industry, which would contain 12% limestone, could...
Friday, November 15, 2019 - 18:15
Decisions made regarding driver sight distance at rural intersections are complex and require considerations for safety, efficiency, and environmental factors. Sight distance, cross-traffic velocity, and vehicle placements significantly affect driver judgment and behavior atthese intersections. A series of rural, two-lane thru-STOP simulated intersections with...
Friday, November 15, 2019 - 18:00
It is critical to understand the travel behavior of pedestrians and cyclists on Louisiana’s roadways.  Not only do pedestrian and cyclist counts assist in research for safety, but these statistics are also essential for planners and policymakers when evaluating the usage of roadways and dictating infrastructure spending. Better understanding of...
Friday, November 15, 2019 - 18:00
Connected vehicle technology creates new opportunities for obtaining knowledge about the surrounding traffic and using that knowledge to optimize individual vehicle behaviors. This project creates an interdisciplinary group to study vehicle connectivity, and this report discusses three activities of this group. First, we study the problem of traffic state (...
Friday, November 15, 2019 - 18:00
The performance of flexible and rigid pavements is known to be closely related to properties of the base, subbase, and/or subgrade. However, some recent research studies indicate that the performance predicted by this methodology shows a low sensitivity to the properties of underlying layers and does not always reflect the extent of the anticipated effect/ So...
Thursday, September 19, 2019 - 16:00
The University Transportation Center at Utah State University sponsors research through the Federal Highway Administration’s University Transportation Center Program. The purpose of this research is to advance technology and expertise in transportation-related fields. This includes research on the best methods to design, monitor, and inspect bridges. When...
Thursday, September 19, 2019 - 16:00
Public–private partnerships (P3s) can provide solutions to the project delivery challenges faced by state departments of transportation (DOTs) and local transportation agencies in delivering surface transportation infrastructure by aligning risks and rewards between public and private sectors, accelerating project delivery, improving operations and asset...
Thursday, September 19, 2019 - 16:00
Road trauma in regional and remote areas of Australia and New Zealand are a major road safety problem. Drivers and riders in regional and remote areas are at an unacceptably greater risk of road deaths and injuries than those living in major cities. This edition of the Austroads Guide to Road Safety Part 5: Road Safety for Rural and Remote Areas provides...
Thursday, September 19, 2019 - 15:45
Wood guardrail posts can be inspected for decay using a non-destructive testing (NDT) technique called stress wave timing (SWT). This project conducted a field investigation on approximately 500 wood guardrail posts using SWT and then analyzed available data to determine factors that may lead to increased wood decay rates. It was determined that locations with...
Thursday, September 19, 2019 - 15:45
This study intended to provide quantitative evaluation of the use of RAP and RCA as base layers in HMA pavements. The study used field and laboratory testing programs and data from WisDOT PIF database quantify the performance of base materials and test sections on pavements with CA, RCA, and RAP base layers. Analysis of the particle size distributions for the...
Thursday, September 19, 2019 - 15:45
Innovative intersections and interchanges have proliferated in the State of Utah over the past several years. Continuous flow intersections and diverging diamond interchanges seem to offer improved traffic performance and safety due to their innovative designs. However, there are no clearly defined guidelines or methodologies for monitoring and measuring their...

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