Safety impacts of differential speed limits on rural interstate highways
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2005-10-01
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OCLC Number:441952575
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NTL Classification:NTL-SAFETY AND SECURITY-Speed Limits;NTL-OPERATIONS AND TRAFFIC CONTROLS-Traffic Flow;NTL-SAFETY AND SECURITY-Highway Safety;
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Abstract:To compare the safety effects of a uniform speed limit (USL) for all vehicles as opposed to a differential speed limit (DSL) for cars and heavy trucks, detailed crash data, speed monitoring data, and traffic volumes were sought for rural interstate highways in 17 States for the period 1991 to 2000. Conventional statistical tests (analysis of variance, Tukey's test, and Dunnett's test) were used to study speed and crash rate changes in the four policy groups. A modified empirical Bayes formation was used to evaluate crash frequency changes without presuming a constant relationship between crashes and traffic volume.
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