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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., 09/19/2019
E.g., 09/19/2019
Monday, April 29, 2019 - 17:15
This reports benchmarks road safety performance for 72 urban areas, mostly in Europe, and illustrates governance solutions to improve urban road safety with case studies conducted in Lisbon (Portugal) and Riga (Latvia). The report proposes new road safety indicators to assess the level of risk for each mode of transport. It finds that a modal shift away from...
Monday, April 29, 2019 - 17:00
Transportation infrastructure intersects challenging terrain that can negatively impact integrity. Minnesota’s climate, geomorphology, and steep terrain along rivers increase the incidence of slope failures such as rockfalls and landslides. WSB was contracted by MnDOT to determine the risk of slope failure along state highways in districts 6, 7, and the...
Monday, April 29, 2019 - 17:00
The purpose of this project was to estimate regionalized safety performance functions (SPFs) for urban and suburban collector roads and at-grade intersections using roadway inventory and crash data from state-owned roadways in Pennsylvania. Five years of crash data (2013-2017) were appended to traffic volume and roadway and roadside features in order to...
Wednesday, April 3, 2019 - 17:45
Advancements in the science of concrete materials have led to the development of a new class of cementitious composites called ultra-high performance concrete (UHPC). UHPC exhibits mechanical and durability properties that make it ideal for use in new solutions to pressing concerns about highway-infrastructure deterioration, repair, and replacement. The use of...
Wednesday, April 3, 2019 - 17:30
Based on bridge failure data compiled by the New York State Department of Transportation, collision, both caused by vessels and vehicles, is the second leading cause of bridge failures after hydraulic. The current AASHTO-LRFD (2012) specification recommends designing a bridge pier vulnerable to vehicular impacts for an equivalent static force of 600 kips (2,670...
Wednesday, April 3, 2019 - 17:30
A rapid and reliable method to detect the activation of contraction joint cracks is needed in order to assess the effectiveness of sawcut depth and timing on new concrete pavements and for forensic investigation when premature slab cracking occurs. A one-sided non-destructive ultrasonic measurement technique is presented that detects the existence of a...
Wednesday, April 3, 2019 - 17:30
Research was undertaken at WSP Opus Research in 2018 to investigate evidence from field studies supporting the performance benefits of polymer modified binders (PMBs) in thin asphalt and chipseal road surfacings. Improved performance benefits claimed for the use of PMB modified thin surfacings include reduced rutting and fatigue cracking in dense asphalt,...
Wednesday, April 3, 2019 - 17:30
Current bridge management systems predict the condition state of bridge elements primarily based on the extent of continuous structural deterioration. While the existing systems deliver a range of capabilities for the management of bridges under normal operational conditions, they lack the capability to take into account the consequences of sudden extreme...
Wednesday, April 3, 2019 - 17:30
This guide, intended for planners interested in improving transit service where traffic congestion constrains its quality, introduces a category of project called the “Tactical Transit Lane” (TTL). These are bus-only lanes installed in congested, dense areas along specific segments where operational data indicate transit vehicle delays and schedule...
Tuesday, February 5, 2019 - 15:45
Smart, connected communities enable those living, working, or traveling in these areas to realize improved quality of life by taking advantage of innovative technologies and collaborative institutional arrangements that facilitate extensive real-time data sharing, effective communications, and evidence-based decision making. These communities are "...
Tuesday, February 5, 2019 - 15:45
Foundations of existing highways and over-river bridges may have significant functional value. Hence, reuse of foundations of existing bridges during reconstruction or major rehabilitation can result in significant savings in costs and time. This report on bridge foundation reuse addresses critical issues encountered during decision-making on foundation reuse,...
Tuesday, February 5, 2019 - 15:45
In this study, the viability of using three test methods for asphalt mixtures and one test method for asphalt binders are investigated. These test methods are: Bending Beam Rheometer (BBR) for creep and strength of asphalt mixtures; low temperature Semi Circular Bend (SCB) test for fracture energy of asphalt mixtures; Dynamic Modulus (E*) test of asphalt...

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