Traffic Safety Evaluation of Nighttime and Daytime Work Zones (2008) / Chapter Skim
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Previous literature indicates that increased crash risks at a given project location are a combination of temporary changes in geometrics and influences due to work activity. Work activity influences can be from drivers distracted by work operations and equipment, turbulence created by work vehicle or equipment access to and from the work area, and temporary lane closures that increase traffic densities (possibly to the point of congestion)
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From page 2... ...
The percentage increases in crash risk for work operations requiring the temporary closure of travel lanes were essentially identical when done at night or during the day. In addition, traffic crashes that occur in nighttime work zones were not necessarily more severe than those that occur in similar daytime work zones, again when compared across similar work operations.
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From page 3... ...
Strategies that appeared to offer a moderate work zone crash reduction potential included the following: • Design of adequate future work zone capacity into highways, • Use of full roadway closures that require traffic detours onto adjacent surface streets, • Use of intelligent transportation system (ITS) strategies to reduce congestion and improve safety, • Improvement of work zone traffic control device visibility, • Efforts to reduce flaggers' exposure to traffic, and • Efforts to reduce workspace intrusions and their consequences – primarily at long-term, high-volume work zones.
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