Design of Construction Work Zones on High-Speed Highways (2007) / Chapter Skim
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Pages 8-17
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From page 8... ...
; or comparisons of frequencies and proportions of work zone crashes with crashes outside of work zones, with and without statistical testing. Analyses of the latter included straight before-during
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. The accuracy and scope of the data sets and the different analysis types led to a wide range of conclusions regarding the magnitudes and characteristics of work zone crashes.
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Although the rate for the single lane closures did appear to increase more significantly than did the rate at the crossover sites, the high degree of variability in rates from site to site kept these differences in accident rates from being detected as statistically significant. An investigation of Indiana interstate highway work zone crashes also looked at before-during crash rates for lane closures and crossovers (13)
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, data were obtained for North Carolina work zone crashes through the Highway Safety Information System. The effects of work zone characteristics on the most seriously injured occupant (no injury, minor, moderate, severe, fatal)
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Final Report for NCHRP Report 581: Design of Construction Work Zones on High-Speed Highways Copyright National Academy of Sciences. All rights reserved.
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2.2.3 Ramps One study (15) investigated changes in accident occurrence during construction at urban freeway entrance-ramp areas and non-entrance-ramp areas to determine if accidents increased disproportionately in the entrance-ramp areas compared with the nonentrance-ramp areas within the construction work zone.
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Final Report for NCHRP Report 581: Design of Construction Work Zones on High-Speed Highways Copyright National Academy of Sciences. All rights reserved.
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Some studies found work zone crashes to be less severe than crashes outside of work zones (6,9) , while others found work zone crashes to be more severe (1,11)
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However, in a comparison of work crashes to crashes outside work zones, a higher percentage of work zone crashes involved heavy vehicles than crashes outside work zones (7)
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• Conclusions regarding the severity of crashes in work zones were mixed. Some studies found work zone crashes to be less severe than crashes outside work zones while others found work zone crashes to be more severe.
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