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., 07/25/2021
E.g., 07/25/2021
Monday, February 8, 2021 - 16:45
Alternative Intersections and Interchanges (A.I.I.s) are designs that improve operations and safety for motorized traffic by strategically adjusting the geometric features at a given location, working on the general principle of redistributing motor vehicle demand at an intersection in an attempt to limit the need to add capacity with new lanes to improve...
Monday, February 8, 2021 - 16:45
In supporting State Departments of Transportation (DOTs) and metropolitan planning organizations (MPOs) in using Geographic Information Systems, the Federal Highway Administration (FHWA) is publishing this Case Study Report focusing on the use of online, geospatial dashboards by transportation agencies to analyze and display operational metrics and performance...
Monday, February 8, 2021 - 16:30
Driving intelligence tests are critical to the development and deployment of autonomous vehicles. The prevailing approach tests autonomous vehicles in life-like simulations of the naturalistic driving environment. However, due to the high dimensionality of the environment and the rareness of safety-critical events, hundreds of millions of miles would be...
Monday, February 1, 2021 - 16:00
This report provides recommendations for integrating both nondestructive evaluation (NDE) data and field data from structural health monitoring (SHM) to obtain load ratings that reliably represent a bridge's load-carrying performance. Modern NDE techniques, which provide accurate location and characterization of deteriorations, enable more reliable...
Monday, February 1, 2021 - 15:45
Many Minnesota bridges have older barriers or parapets that met the design code at the time of construction in the 1950s. Many of these bridge barriers no longer meet current strength and performance requirements of NCHRP Report 350 or the Manual for Assessing Safety Hardware (MASH). As the Minnesota Department of Transportation (MnDOT) begins to rehabilitate...
Monday, February 1, 2021 - 15:45
Urban travel patterns are affected by many factors including changes in demography, land use, economics, technology, and mobility options. Public transportation must evolve to remain responsive. The TRB Transit Cooperative Research Program's TCRP Research Report 221: Redesigning Transit Networks for the New Mobility Future presents case studies and...
Monday, February 1, 2021 - 15:45
In 2020, the novel coronavirus pandemic (COVID-19) enveloped the world, leading to a public health crisis that profoundly changed all aspects of society, including transportation. With public transit and shared mobility at a critical juncture, the University of California’s Institute of Transportation Studies (UC ITS) and the Transportation Research Board...
Monday, January 25, 2021 - 15:30
asPECT provides a methodology to calculate the life cycle greenhouse gas emissions or ‘carbon footprint’ of asphalt used in highways.  The tool and supporting docuemntation is available from the UK Transportation Research Laboratory (TRL) web site at https://trl.co.uk/permanent-landing-pages/asphalt-pavement-embodied-carbon-tool-aspect/...
Monday, January 25, 2021 - 15:15
Automated driving systems (ADS) have the potential to fundamentally change transportation, and a growing number of these systems have entered the market and are currently in use on public roadways. However, drivers may not use ADS as intended due to misunderstandings about system capabilities and limitations. Moreover, the real-world use and effects of this...
Monday, January 25, 2021 - 15:15
Compaction is one of the most important factors that affects the durability of asphalt pavements. Many studies have been focused on developing methods to improve compaction. Previously, the authors found that the addition of small percentages of Graphite Nanoplatelets (GNPs) significantly increase the compactability of asphalt mixture. Traditional viscosity...
Monday, January 18, 2021 - 20:30
The main goal of this project was to identify focus crash and facility types (FCFTs) and associated contributing factors to better inform applications of systemic safety improvements. The selection of FCFTs was guided by the use of the Fatality Analysis Reporting System and the Highway Safety Information System (HSIS) databases (NHTSA 2018a; FHWA 2018c). The...
Monday, January 18, 2021 - 20:15
This document serves as a quick reference guide for transportation professionals in State and local agencies that are interested in applying a systemic approach to road-safety management. This guide provides brief overviews of the systemic approach, common target crash types and their associated facility types, and contributing factors. It also provides a six-...

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