United States Department of Transportation
i
Best Practices for Work Zone Safety During Traffic Control Placement, Removal, and Modification – Phase II
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2024-02-01
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[PDF-15.27 MB]
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Abstract:The set-up, removal, and modification of temporary work zone traffic control on multi-lane, high-speed roadways can create hazardous exposures for workers and motorists. A comprehensive literature review on the topic reveals a lack of a standard process and detailed guidance for setting up and removing traffic control. This study aimed to investigate the safety hazards and risk present during set-up, removal, and modification of temporary traffic control, and identify practices for improving safety during traffic control deployment and removal. Based on a survey of state DOT and roadway contractor personnel, the traffic control activities that present the highest risk are placement of the initial signs and merging taper, retrieval of knocked over cones and barrels in a live traffic lane, and set-up and removal of traffic control near an open on-ramp. Case study investigations were conducted of three recommended treatments – electronic roadway flares, a PCMS, and a radar speed sign – placed in the shoulder upstream of the Road Work Ahead (RWA) sign. Statistical analyses of vehicle speed data reveal that mean speed decreased at the treatment location with the treatments present, and mean speed differential was greater with the treatments present. It is recommended that state DOTs and roadway contractors incorporate placement of the treatments upstream of the RWA sign for traffic control to enhance safety during traffic control set-up and removal on multi-lane, high-speed roadways.
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