Traffic Safety Evaluation of Nighttime and Daytime Work Zones (2008) / Chapter Skim
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Pages 4-7
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From page 4... ...
Rather than continuing to rely on conjecture and subjective opinion, NCHRP initiated this project to objectively determine and document how nighttime and daytime work zones affect traffic safety. Four specific objectives were identified: • Determine the crash rates for nighttime and daytime work zones; • Determine the nature of, and identify similarities and differences between, traffic-related crashes in nighttime and daytime work zones; • Develop management practices that promote safety and mobility in nighttime and daytime work zones; and • Develop work zone crash reporting recommendations to further improve the data collected on work zone crashes.
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From page 5... ...
Nighttime versus Daytime Work Zone Crashes Decisions about whether to perform work in travel lanes during daylight hours or at night should be based, in part, on which approach is likely to yield the lowest crash costs over the duration of the project (35)
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From page 6... ...
The literature does imply that the amount of increased crash risk at a given project location is a combination of temporary changes in geometrics and influences due to work activity. Work activity influences can be 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 7... ...
Certainly, differences in the severity of the increased crashes may also exist between daytime and nighttime work operations, which also must be considered in the analysis. Together, this implies that the use of additional crash costs, normalized on the basis of the amount of work activity required at a given project location, will most closely reflect the information that highway agencies must weigh in their decisions of whether or not to work at night.
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