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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
Tuesday, August 30, 2016 - 15:15
This document is intended as a guide for use by Metropolitan Planning Organizations (MPO) and other planning agencies that are interested in applying Dynamic Traffic Assignment (DTA) models for planning applications. The objective of this document is to provide guidance on key practical aspects of working with DTA models, namely, information about model...
Tuesday, August 30, 2016 - 15:15
In order to better understand the curling and warping behavior of Portland cement concrete (PCC) pavements in Iowa and provide recommendations to mitigate curling and warping deflections, field investigations were performed at six existing sites during the late fall of 2015. These sites included PCC pavements with various ages, slab shapes, mix design aspects,...
Tuesday, August 16, 2016 - 18:45
Connecticut DOT trialed Uniform Compaction (UC) equipment on 2 pilot projects during the 2014 construction season. This equipment included everything that would be used for Intelligent Compaction (IC) with the exception of the stiffness measurement instrumentation. The intention was to investigate whether the use of the equipment would lead to better coverage...
Tuesday, August 16, 2016 - 18:45
In a joint study between Minnesota DOT and the University of Minnesota, the field performance and mechanical properties of asphalt mixtures from pavement sections treated with a number of new products, called bio sealants, is investigated. The objective of the study is to obtain relevant properties of treated asphalt materials to understand the mechanism by...
Tuesday, August 16, 2016 - 18:45
MRIGlobal developed an automated system to measure and display the distance between two instrumented vehicles traveling along a road. The system uses GPS modules and radio modems to send location information between the vehicles five times per second. A field software was developed to calculate the distance between the vehicles based on this GPS data in real...
Wednesday, August 3, 2016 - 15:15
This synthesis from Transportation Research Board documents the state-of-the-practice on how the transportation community is protecting roadways and mitigating damage from inundation and overtopping. This report highlights major issues and design components specific to roadway embankment damage from flooding. It documents the mechanics of damage to the...
Friday, July 8, 2016 - 15:15
Potholes are a major problem in many parts of the world. This guide sets out the principal options for repairing potholes before describing a procedure for selecting an appropriate option for different situations using a series of flowcharts. There are default values for the various questions asked in the flowcharts, but other values can be used to reflect the...
Tuesday, July 5, 2016 - 14:45
Traffic control devices, such as rectangular rapid-flashing beacons (RRFBs), have been shown to increase the number of drivers yielding to crossing pedestrians. This TechBrief describes the methodology and results from an open-road study sponsored by FHWA that examined driver yielding behavior at crosswalks with RRFBs positioned above the pedestrian crossing...
Wednesday, June 22, 2016 - 18:00
From 2006 to 2014, ten right‐turn approaches in the Peoria, Illinois, area were selected and reconstructed with a modified right‐turn lane design. The major purpose of the modified design was to improve the line of sight for passenger vehicles attempting to turn right, while also accommodating semi‐tractor trailer trucks. While the actual changes varied among...
Wednesday, June 22, 2016 - 18:00
This US TRB report evaluates and assesses existing guidelines for the design, installation, monitoring, and maintenance of environmentally sensitive stream bank stabilization and protection measures, and develops quantitative engineering design guidance for selected treatments. Updated design guidelines for three widely used treatments are presented: live...
Wednesday, June 22, 2016 - 18:00
Bridge performance measures are important components of any successful Bridge Management System. Different types of performance measures have been developed for various purposes. The types of performance measures are usually a reflection of an agency’s goals. The bridge health or condition index is a type of performance measure used by agencies interested...
Wednesday, June 22, 2016 - 17:45
When more cyclists turn to the roads in Oslo each spring, the risk for each cyclist of being involved in a conflict or near miss is reduced. In other words, there is proof of a Safety in Numbers effect. Comparing Norwegian road users with their Danish and Swedish counterparts shows that this effect can either be accentuated or reduced by differences in...

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