United States Department of Transportation
i
Evaluation of non-freeway rumble strips - phase II.
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2015-03-01
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[PDF-2.27 MB]
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Abstract:MDOT’s rumble strip program for two-lane high speed rural highways was initiated in 2008 and
continued through 2010. This program included implementation of centerline rumble strips (CLRS)
on nearly 5,400 miles of two-lane high speed roads that MDOT maintains. This program presented
an opportunity to perform a comprehensive evaluation of safety performance of rumble strips,
especially CLRS. A two-phase evaluation study of the program was launched to estimate the driver
behavioral and performance improvement in the presence of CLRS on two-lane high speed highways
and also perform a system-wide “Before” and “After” study of target traffic crashes. The driver
behavior-related study and collection of the three years’ “Before” crash data and analysis was
performed in Phase I (OR09084A) and the Phase II study was performed to collect the three years of
“After” crash data, a program evaluation study, and benefit-cost analysis. The crash analysis
indicated statistically significant reductions in all target crashes including, head-on, sideswipe
opposite and run-off-the-road left. The study of crashes and their severity resulted in the reduction in
fatal and all categories of injury crashes including a 47% reduction in total target crashes and a 51%
reduction in target fatal crashes. An economic analysis of the rumble strip program resulted in a
benefit-cost ratio of the program to be in the range of 58:1 to 18:1 based on discount rate
assumptions of 2% and 10%, respectively. A road user survey indicated strong agreement among the
respondents that CLRS is a beneficial safety improvement program.
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