United States Department of Transportation
i
Impact of non-freeway rumble strips phase 1.
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2012-06-26
[PDF-2.14 MB]
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Edition:Final report; June 1, 2010-June 30, 2012.
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Abstract:In an effort to reduce lane-departure crashes, in 2008 the Michigan Department of Transportation (MDOT) began a
three-year statewide non-freeway rumble strip installation initiative. This initiative called for the installation of
milled centerline rumble strips on all rural non-freeway highways with a posted speed limit of 55 mph and a paved
roadway width greater than 20 ft and shoulder rumble strips on roadways with paved shoulders that were at least 6 ft
wide. Approximately 5,400 miles of non-freeway roadways were ultimately included in this rumble strip
installation initiative. As this initiative was believed to be the largest of its kind in the United States at the time, it
was important for MDOT to evaluate the impacts associated with the rumble strip installations to provide guidance
for future implementation both within Michigan and other states. The objectives of this study included: Identification and analysis of “Before” traffic crashes; Assessment of impact of rumble strips on driver behavior, bicyclist safety, roadside noise, and shortterm
pavement performance.
Several field data collection efforts were undertaken in order to accomplish the objectives. Based on the results of
the evaluation, it is concluded that rumble strips on high-speed non-freeway highways improves driver performance
on most highways and traffic scenarios. Vehicles produced higher levels of roadside noise when traveling over the
rumble strips compared to normal passbys. The rumble strip noise typically did not exceed the roadside noise level
produced by tractor trailer trucks traveling on normal highways. Finally, centerline rumble strips did not contribute
to short-term transverse cracking are in asphalt pavements. Three years of “Before” crash data were analyzed to
identify the target crashes that is expected to be alleviated by the installation of centerline rumble strips on MDOT’s
high-speed trunkline (non-freeway) system.
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