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., 11/28/2022
E.g., 11/28/2022
Tuesday, June 14, 2022 - 20:30
Without adequate drainage, stormwater can accumulate on road surfaces creating safety hazards including vehicle hydroplaning, road spray, and obscured roadway markings. Therefore, it is essential for designers to have tools that accurately represent water accumulation, movement, and capture within the roadway environment so that criteria for allowable spread...
Tuesday, June 14, 2022 - 20:30
This research report documents changes to Edition 3.2 of the Austroads Guide to Road Design Part 6: Roadside Design, Safety and Barriers, and in particular, Sections 4, 5 and 6. This research report also provides background information to the guidance and commentary which informs the reader on aspects of the Guide. The topics covered include the flexibility of...
Tuesday, June 14, 2022 - 20:15
Determining the value of a transportation organization's physical assets is important for both financial reporting and transportation asset management (TAM). The TRB National Cooperative Highway Research Program's NCHRP Web-Only Document 335: A Guide to Computation and Use of System-Level Valuation of Transportation Assets details how to calculate...
Tuesday, June 14, 2022 - 20:15
College and university students in the Greater Toronto and Hamilton Area (GTHA) account for more than 600,000 daily commuters on an already crowded transportation system. To better understand the habits and needs of students who use transportation, StudentMoveTO began researching ways to improve student transportation in 2018. Ten universities and colleges from...
Tuesday, June 14, 2022 - 20:00
Lighting of pedestrian facilities plays a key role in increasing the safety performance of the road network for all users. Effective pedestrian lighting installations are a means of addressing the vulnerability of pedestrians during dark conditions and improving safety and security of all road users spanning different ages and abilities, including wheelchair...
Tuesday, June 14, 2022 - 20:00
The Minnesota Department of Transportation conducted a 12-month distance-based fee (DBF) demonstration that utilizes existing technologies embedded within shared mobility (SM) fleet vehicles and connected and automated vehicles (CAVs) to automatically calculate and collect the fees. As part of the demonstration, researchers at the Humphrey School of Public...
Tuesday, June 14, 2022 - 20:00
Digital message signs (DMS) are a vital part of the advanced traveler information systems (ATIS) that disseminate various real-time travel information to the road users, including traffic diversion, travel time, congestion, upcoming roadwork, lane closures, and incidents such as accidents. Other information includes inclement weather, speed regulations, special...
Monday, June 6, 2022 - 15:15
The use of roundabouts in rural areas of the US is growing rapidly. For roundabouts constructed with concrete pavement, joint layout can be especially challenging. To reduce the need for sophisticated joint layouts, consideration is being given to constructing roundabouts without joints and instead using structural fiber reinforced concrete (FRC) to bridge any...
Monday, June 6, 2022 - 14:45
Although the use of recycled asphalt materials (RAM) in new asphalt mixtures can reduce the amount of virgin and nonrenewable materials required and increase the rutting resistance of pavements, it may also compromise cracking resistance. To mitigate this issue, asphalt mixtures containing RAM may require the use of a softer binder or recycling agent (RA)....
Monday, May 30, 2022 - 18:30
The Tipping Point – What COVID-19 Travel Reduction Tells Us About Effective Congestion Relief uses observed data collected before and during the COVID-19 pandemic in the Twin Cities metropolitan area to answer a question with important implications for highway investment planning and travel demand management: At what level of vehicle miles traveled (VMT)...
Monday, May 30, 2022 - 18:15
For several decades, stated preference (SP) studies have been the dominant method for transport valuation. However, there are many indications that revealed preference data is making a strong comeback due to access to Big Data and new analysis possibilities such as machine learning. In this report, we assess the capability of different RP data sources. We find...
Monday, May 30, 2022 - 18:15
This guide presents the basic principles that a pavement engineer needs to design and construct concrete overlays on existing asphalt, composite, and concrete pavements.   The intent of this guide is to increase the technical proficiency of experienced engineers in the use of concrete overlays, provide less experienced users with the essential knowledge...

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