Turner-Fairbank Highway Research Center

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NCHRP Report 627: Traffic Safety Evaluation of Nighttime and Daytime Work Zones

Product Type

Research Report


Ullman, G.L., M.D. Finley, J.E. Bryden, R. Srinivasan, and F.M. Council




This report presents the findings of a research project to determine the crash rates for nighttime and daytime work zones, develop management practices that promote safety and mobility in work zones, and develop work-zone crash reporting recommendations to further improve the data collected on work zone crashes. The report will be of particular interest to practitioners responsible for work zone safety.

Link To Research Report

NCHRP Report 627: Traffic Safety Evaluation of Nighttime and Daytime Work Zones


Accident rates
Accident reports
Data collection
Daytime accidents
Nighttime accidents
Occupational safety
Work zone safety
Work zone traffic control

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HSIS Summaries

HSIS Summary Reports are two to eight pages in length and include a brief description of the issue addressed, data used, methodology applied, significant results, and practical implications.

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Research Reports

A variety of research studies have been performed using data from HSIS. Many of the final reports prepared are now available electronically.

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Research reports are often summarized in executive summaries, technical briefs, or other abbreviated formats. Included here are those road safety summaries that involved research using HSIS data.

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