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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., 09/19/2019
E.g., 09/19/2019
Wednesday, August 28, 2019 - 19:00
Data standardization is recognized in many disciplines as a critical aspect of data stewardship. Establishing and implementing data specifications increases the usefulness of data collection efforts and facilitates analysis techniques. With the advent of large quantities of machine-generated data, the use of standardized data formats feeds opportunities for...
Wednesday, August 28, 2019 - 19:00
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, August 28, 2019 - 19:00
A toolkit for responding to natural disasters is outlined in Regional Resilience Toolkit: Five Steps to Build Large Scale Resilience to Natural Disasters, a report by the U.S. Environmental Protection Agency. The toolkit describes a coordinated process for meeting many different state and federal planning requirements and provides guidance on communication and...
Wednesday, August 28, 2019 - 19:00
Dynamic and responsive transportation systems are a core pillar of equitable and sustainable communities. Achieving such systems requires comprehensive mobility data, or data that reports the movement of individuals and vehicles. Such data enable planners and policymakers to make informed decisions and enable researchers to model the effects of various...
Wednesday, August 28, 2019 - 19:00
The objective of this synthesis is to document practices used by state departments of transportation (DOTs) for designing and maintaining roadsides adjacent to urban freeways. The synthesis focuses on high visibility freeway roadsides with limited pedestrian access. These areas often have wide medians, interchanges, and overpasses. Information used in this...
Wednesday, August 28, 2019 - 18:45
This paper compares the Public Private Partnership model for funding of infrastructure projects with an alternative approach, the Regulatory Asset Base model. It considers whether the ability to levy user charges is necessary to ensure low financing costs, or whether these stem from other factors. The paper is part of a series of 19 papers and a synthesis...
Wednesday, August 28, 2019 - 18:45
This report documents the work conducted under NCHRP Project 17-55 by the Texas A&M Transportation Institute. The researchers conducted 43,000 simulations for various combinations of roadside slope configurations and geometric conditions that represent real-world crash scenarios. The simulations were performed using vehicle models that represented a variety...
Wednesday, August 28, 2019 - 18:45
Pedestrian fatalities and injuries represent a growing percentage of all traffic fatalities and injuries. This project used amultifaceted approach to improving compliance to the Minnesota crosswalk law in Saint Paul, Minnesota, including: (1) education, (2) measurement, (3) enforcement efforts, (4) social norming, and (5) engineering treatment. The multifaceted...
Wednesday, August 28, 2019 - 18:45
Organizational or Enterprise Risk Management (ERM) is the formal and systematic effort to control uncertainty and variability to an organization's strategic objectives by managing risks at all organizational levels (enterprise, program, project, and activity). Enterprise risk management is an approach to address risks at all levels of the organization. It...
Wednesday, August 28, 2019 - 18:30
In an effort to reduce the number of single vehicle run-off-road and two-lane two-way crossover crashes, TxDOT has implemented various audible lane departure warning systems on seal coat road surfaces. This 20-month research project explored the effectiveness of these various treatments using several performance metrics and provided recommendations on...
Wednesday, August 28, 2019 - 18:30
The objective of this study was to evaluate long-term aging effects on asphalt mixtures using the Illinois Flexibility Index Test (I-FIT) and to develop a corresponding long-term aging protocol. The study recommended the use of the forced-draft oven as the aging equipment because of its availability, feasibility, practicability, capacity, and acceptable...
Wednesday, August 28, 2019 - 18:30
When the sightlines along horizontal roadway curves are restricted, there are challenges to find acceptable solutions. Designers compensate for the limitations on driver sight distance in various ways, including: accepting shorter sightlines, lowering design speed, increasing shoulder width, or providing additional signage. There are advantages and...

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