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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., 11/22/2017
E.g., 11/22/2017
Thursday, March 3, 2016 - 19:30
Seal coats are one of many techniques commonly used for asphalt pavement preservation and chip seals are the most commonly used in Minnesota. In some applications, chip seals are not the best surface treatment alternative, such as in areas with frequent or high stress turning movements like cul-de-sacs or intersections, and can suffer chip loss and/or bleeding...
Thursday, March 3, 2016 - 19:30
Intersection conflict warning systems (ICWS) are intended to reduce the frequency of crashes by alerting drivers of conflicting vehicles on adjacent approaches at unsignalized intersections, particularly those with one-way or two-way stop control. Few studies have explored the safety effectiveness of ICWS; the effectiveness has not been shown for four-legged...
Wednesday, March 2, 2016 - 22:30
Engineered fills, including compacted granular fill and reinforced soil, are a cost-effective alternative to conventional bridge foundation systems; however, limited guidance exists on estimating the settlement and lateral deformation of these features under service conditions. Additionally, the stress distribution within these features is not well understood,...
Monday, February 29, 2016 - 21:30
To improve the safety at school bus stops, the Ohio Department of Transportation (ODOT) conducted a study to identify available technologies or methods that could actively warn motorists of the presence of a school bus at an upcoming school bus stop. A scan of the current practice found that all States use static School Bus Stop Ahead signs similar to Ohio...
Friday, February 19, 2016 - 21:00
This guide provides information and resources to help transportation management, operations, and maintenance staff incorporate climate change into their planning and ongoing activities. It is intended for practitioners involved in the day-to-day management, operations, and maintenance of surface transportation systems at State and local agencies. The guide...
Friday, February 19, 2016 - 18:00
Accurate traffic counts are important for budgeting, traffic planning, and roadway design. With thousands of centerline miles of roadways, it is not possible to install continuous counters at all locations of interest (e.g., intersections). Therefore, at the vast majority of locations, MnDOT samples axle counts for short durations, called portable traffic...
Thursday, February 11, 2016 - 16:30
TRB’s National Cooperative Highway Research Program (NCHRP ) Web-Only Document 220: Estimating the Life-Cycle Cost of Intersection Designs describes the Life-Cycle Cost Estimation Tool (LCCET). The LCCET spreadsheet allows users to compare alternative intersection designs based on initial construction costs, ongoing maintenance and operations costs,...
Tuesday, February 9, 2016 - 18:30
This guide may be used by project planners and designers as a resource for considering, evaluating and designing separated bike lanes as part of a complete streets approach for providing safe and comfortable accommodations for all roadway users. The full document is available on tne Massachusetts Department of Transportation web site at http://www.massdot.state...
Friday, February 5, 2016 - 16:00
This report is part of the Human Factors for Connected Vehicles (HFCV) research program, whose goal is to minimize driver workload by eliminating connected vehicle (CV) device-related distractions. The research described in this document is part of an effort to develop initial design guidance for vehicle-to-infrastructure (V2I) safety messages provided using...
Wednesday, February 3, 2016 - 20:30
The purpose of this state-of-the-practice review is to identify the current use of data by metropolitan planning organizations to perform planning for operations activities. This information will be used to develop the virtual data access framework and to help establish requirements for the data that should be accessible by planning agencies via the framework....
Wednesday, February 3, 2016 - 20:30
Minnesota county engineers have sometimes observed heaves and dips near centerline culverts during cold winter months. In these instances, during the late winter and early spring, the area where a culvert has been replaced does not heave or heaves only slightly, while the roadway on either side of the replaced culvert heaves. The heave and dip disappear...
Friday, January 29, 2016 - 16:15
Anecdotal information indicates that private investment and property value increases are associated with featured Complete Streets projects. However, to date, little research has been done to confirm these benefits. Much of the relevant literature focuses on very real and important improvements to the safety of all who use Complete Streets: pedestrians,...

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