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Work Zone Safety Information Clearinghouse

Library of Resources to Improve Roadway Work Zone Safety for All Roadway Users

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Training

Work Zone Driveway Assistance Devices (DADs): Past Research & Evaluation of Display Strategies

The Driveway Assistance Device (DAD) is an experimental device used to direct traffic onto a bi-directional, single-lane work zone from a driveway or side street. This device uses alternating flashing arrows to indicate the traffic flow direction along the work zone segment in order to reduce wrong-way driving. Although several states have experimented with DADs in various work zone settings, there remains a lack of consensus regarding the design aspects and the general effectiveness. To help address these issues, research was performed to evaluate various aspects of the DAD design, including auxiliary sign messages, signal configuration, and arrow color.

Provider: Iowa State University
Languages: English
Website: Link to URL
Notes:

The webinar was held on March 19, 2021. The recording for this webinar is available at the website above.

Record Types: Webinars
Topics: Portable Traffic Signals; Temporary Traffic Control; Work Zones

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American Road and Transportation Builders Association Transportation Development Foundation, American Road and Transportation Builders Association U.S. Department of Transportation Federal Highway Administration Texas A&M Transportation Institute