Evaluation of Channelizing Devices for Work Zones: Type II Barricades and Chevron Panels

Report No: 83-R21

Published in 1982

About the report:

The objectives of this research were (1) to evaluate the 4-in. (10.2-cm) and 6-in. (15.2-cm) wide alternating diagonal stripes on barricade rails less than 3 ft. (0.92-m) long, and (2) to select the most effective chevron panel. A secondary objective was to investigate minimum sight distance requirements for work zone lane closures. These objectives were accomplished by (1) conducting field tests on the channelizing devices using the position of lane changing as the measure of performance and (2) conducting observer evaluations to obtain detection and legibility distances and preferences for various channelizing devices and taper arrays. It was found that the 6-in. (15.2-cm) wide stripes barricade rails less than 3 ft. (0.92 m) long were more than the 4-in. (10.2-cm) wide stripes. A chevron (18 in. x 24 in. [0.46 m x 0.61 m]) with a black arrow was more effective than a chevron with a white arrow. Overall, the large chevron (24 in. x 30 in. [0.61 m x 0.77m]) with a black arrow and 80-ft. (24.2-m) spacing was the most effective chevron panel. The chevron w black arrow and 40-ft. (12.2-m) taper spacing was rated second overall effectiveness. A minimum desirable sight distance of 1,500 ft. (457.5 m) and a minimum allowable sight distance of 1,000 ft. (305 m) were suggested for work zone lane closures.

Disclaimer Statement:The contents of this report reflect the views of the author(s), who is responsible for the facts and the accuracy of the data presented herein. The contents do not necessarily reflect the official views or policies of the Virginia Department of Transportation, the Commonwealth Transportation Board, or the Federal Highway Administration. This report does not constitute a standard, specification, or regulation. Any inclusion of manufacturer names, trade names, or trademarks is for identification purposes only and is not to be considered an endorsement.

Last updated: January 18, 2024

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