Analysis of Accidents at Long-Term Construction Projects in Texas
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1991-06-01
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Edition:Interim Report
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Abstract:This report presents an analysis of accidents at five long-term freeway construction projects in Texas during 1984-1988. Data were collected from each project for two to three years prior to construction and for all years during construction through 1988. Total accidents on the main lanes increased an average of 28.7% during construction. Severe accidents on the main lanes increased by a greater percentage, on the average, than did PDO accidents (38.8% versus 24.9%). Nighttime accidents on the main lanes increased by a greater proportion than did daytime accidents (37.4% versus 24.4%). Frontage road accidents at the five projects increased by an average of only 2.4% during construction. The average changes in PDO and severe accidents, daytime and nighttime accidents, and in the various accident type categories on the frontage road were also found to be negligible. A statistical test of homogeneity of the changes in accidents from project to project indicated that the average changes in total main lane accidents, severe accidents, single vehicle, and multi-vehicle (excluding rear-end) accidents were consistent from project to project, and could be used as reasonable estimates of the expected impacts for future projects. Significant site-to-site variations in the other accident categories were detected, however.
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