Light use study for vertical channelization devices
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2003-05-01
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Abstract:Although the Manual on Uniform Traffic Control Devices (MUTCD) does not require the use of warning lights on channelization devices, the Arizona Department of Transportation (ADOT) has historically required their use on all traffic control devices used at nighttime construction zones. This report documents research done for ADOT on the use of steady-burn warning lights on vertical panels in roadway construction zones. Specific tasks included a review of the requirements and policies of the departments of transportation of other states regarding the use of flashing warning lights on traffic control devices, a review of ADOT?s construction zone requirements, a search for relevant research, reviews of construction zone accident reports and incident logs, and interviews with ADOT field construction staff regarding the past performance of the Ultra Panels (Type III sheeting) with and without steady-burn warning lights. The literature search found sources that support this requirement and other sources that state it is unnecessary. Two of the thirty-four transportation agencies that responded to the survey reported that they had requirements for steady-burn lights similar to Arizona requirements: the Alberta (Canada) Ministry of Transportation and the Illinois Department of Transportation (for roadways with traffic levels over 2,500 vehicles per day). The Ultra Panel, a type of vertical panel, has been successfully used without warning lights on three highway construction projects in Arizona. ADOT field construction staff associated with these projects strongly supported the use of these vertical panels without warning lights. A review of accident records and incident reports did not reveal any significant deficiencies associated with the vertical panels used without warning lights.
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