United States Department of Transportation
i
Advance traffic control warning systems for maintenance operations : final report.
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1976-07-01
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[PDF-1.82 MB]
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Abstract:The report discusses the effect of certain variables defined by sign size, height of installation and legend on the driver responses as measured by speed, conflict and queuing parameters. Effects of electronically actuated, directional flashing signs were also evaluated in terms of the above defined responses. The experiment was conducted at four locations within the State on two-lane and Interstate systems requiring single lane closures during maintenance. The conclusions that follow are based on the analysis and evaluation of the various responses using the analysis-of-variance procedure. (1) The speed decrease at two-lane locations was greater for the 30-inch (0.762 m) signs than either the 36-inch (0.914 m) or the 48-inch (1.22 m) signs. (2) At Interstate locations, the 36-inch (0.914 m) signs yielded better overall response than the corresponding 30-inch (0.762 m) signs. (3) The height of sign installation and sign legend did not indicate any statistical difference in the measured responses. (4) Sequencing accumulative difference in the measured responses. (5) Sequencing accumulative bidirectional chevrons greatly enhanced the obedience of the driver to warning signs.
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