A recently completed study shows that rumble strips are proving to be an effective and low-cost way to reduce crashes on Michigan's state highways. The Michigan Department of Transportation started a major rumble strip program for two-lane high-speed rural highways in 2008. The study, conducted by the Wayne State University Transportation Research Group, found significant reductions in several targeted categories of crashes, including head-on, sideswipe and run-off-the-road crashes. The study showed a 47 percent reduction in total crashes and a 51 percent reduction in fatal crashes. "This study is one of the largest and most comprehensive investigations of effectiveness of any safety countermeasure that has ever been performed at a state level," said Tapan Datta, a WSU civil engineering professor and principal investigator of the research project. "Analyzing all of MDOT's two-lane high-speed highways with rumble strip treatments targeted to alleviate lane departure-related traffic crashes makes the results real and reliable. They can be used by other states to establish their own rumble strip programs." Datta said future research should focus on use of rumble strips on two-lane county roads and multi-lane non-freeway high speed roads.

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