Home

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., 02/25/2020
E.g., 02/25/2020
Friday, February 21, 2020 - 19:15
Moisture increase in pavement subsurface layers has an essential influence on granular material properties and affects expected pavement performance. Over time, moisture variations in the base layer of a flexible pavement depend on water infiltration after rain and pavement surface conditions. Consequently, the base layer resilient modulus (MR) is decreased...
Friday, February 21, 2020 - 19:15
From the work that has been performed in Phase 1 of the Ultra-Thin Bonded Wearing Course (UTBWC) Snow, Ice, and Wind Effects TRS, we understand that UTBWC pavement occasionally experiences negative pavement performance attributes in cold weather, requiring additional maintenance (beyond typical treatments) to remedy. Observations indicate a phenomenon of ice...
Friday, February 21, 2020 - 19:15
The existing online mapping systems process many user route queries simultaneously, yet solve each independently, using typical route guidance solutions. These route recommendations are presented as optimal, but often this is not truly the case, due to the effects of competition users experience over the resulting experienced routes, a phenomenon referred to in...
Friday, February 21, 2020 - 19:15
This study developed a number of models to estimate the relationships between land use, transit ridership, household expenditures, and municipal spending, with a focus on small urban areas. First, a regression model was developed that estimated transit ridership in small urban areas as a function of service quantity, service characteristics, the unemployment...
Friday, February 21, 2020 - 19:15
This project refined the Natural Resources Research Institute’s (NRRI's) patented taconite-based repair compound, explored equipment options, and field tested/demonstrated a low-cost mechanized system that can efficiently mix and place the repair compound in larger quantities while minimizing or eliminating direct contact and hand mixing by...
Friday, February 21, 2020 - 19:00
This paper discusses whether changes in mobility practices affect value of travel time savings. It considers the relationship between the theory of the value of time and its practical application in traffic models and cost-benefit analysis. The discussion covers the need to distinguish variations in utility due to changes in the quantity and quality of time...
Friday, February 21, 2020 - 19:00
Pricing externalities from vehicle use such as road damage, vehicular emissions (both greenhouse gases and local pollutants), and congestion has become an important topic in the transportation sector in recent years. Road user charge pilot programs are being explored in various states in the U.S.; cities like New York and San Francisco are following in the...
Friday, February 21, 2020 - 19:00
Crash analysis methods typically use annual average daily traffic as an exposure measure, which can be too aggregate to capture the safety effects of variations in traffic flow and operations that occur throughout the day.  Flow characteristics such as variation in speed and level of congestion play a significant role in crash occurrence and are not...
Friday, February 21, 2020 - 19:00
The Regional Transportation Management Center (RTMC) at the Minnesota Department of Transportation (MnDOT) deploys a large number of traffic detectors in the Twin Cities’ freeway network and continuously collects traffic data. While RTMC mainly uses the data for traffic and incident management, the TFA (Traffic Forecasting and Analysis) office uses the...
Friday, February 21, 2020 - 19:00
In Wyoming, most county paved roads were built decades ago without following minimum design standards. However, the recent increase in industrial/mineral activities in the state requires developing an efficient pavement management system (PMS) for local paved roads. The new PMS which is currently being developed depends on the present serviceability index (PSI...
Friday, February 21, 2020 - 18:45
Given the potential of transit-bus automation, it is critical to evaluate the benefits and challenges from early implementations. A well-designed evaluation can quantify such societal benefits as improving travel time, increasing mobility, and raising transit ridership. This guide aims to assist transit stakeholders with designing and implementing evaluations...
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...

Pages