Safety effects of differential speed limits on rural interstate highways
NJ Garber, JS Miller, B Yuan… - Transportation research …, 2003 - journals.sagepub.com
To compare the safety effects of a uniform speed limit (USL) for all vehicles and a differential
speed limit (DSL) for cars and heavy trucks, crash, speed, and volume data for rural
Interstate highways for the period 1991 through 2000 were obtained from nine states. These
states were divided into four policy groups based on the type of speed limit employed during
the period: maintenance of a uniform limit only, maintenance of a differential limit only, a
change from a uniform to a differential limit, and a change from a differential to a uniform …
speed limit (DSL) for cars and heavy trucks, crash, speed, and volume data for rural
Interstate highways for the period 1991 through 2000 were obtained from nine states. These
states were divided into four policy groups based on the type of speed limit employed during
the period: maintenance of a uniform limit only, maintenance of a differential limit only, a
change from a uniform to a differential limit, and a change from a differential to a uniform …
Safety impacts of differential speed limits on rural interstate highways
NJ Garber, JS Miller, B Yuan, X Sun - 2005 - rosap.ntl.bts.gov
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 …
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 …