Evaluation of bypass lane safety, operations, and design in Kansas : [technical summary].
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2015-08-01
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Abstract:The construction of bypass lanes at rural intersections has typically been considered
a low-cost highway safety improvement by the transportation community.
However, this needs to be quantitatively evaluated so that decisions can be made
on whether to continue adding bypass lanes. Highway safety analyses utilize two
common approaches to evaluate the effectiveness of a treatment: before-and-after
study and cross-sectional study, both of which were utilized in this study. For
the before-and-after study approach, this research performed paired sample t-test statistical analysis to estimate changes in total crash frequencies, crash rates,
Equivalent Property Damage Only (EPDO) crash frequencies, and EPDO crash
rates at intersections 3 to 5 years after the addition of bypass lanes, compared
to 3 to 5 years before bypass lane additions. Crash data between 1990 and 2011
were obtained from the Kansas Crash and Analysis Record System (KCARS),
maintained by the Kansas Department of Transportation (KDOT). For the cross-sectional study, intersections with bypass lanes were compared to intersections
with no bypass lanes, for which crash data were obtained for more than 1,100
intersections in Kansas.
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