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Frequently Asked Questions

Q. How does a shoulder rumble strip increase highway safety?

shoulder rumble strips

A. Rumble strips placed on the shoulders, just beyond the traveled portion of the roadway, reduce drift-off-the-road crashes by warning drivers they are entering a part of the roadway not intended for routine traffic use.

According to the Iowa Department of Transportation, 37 percent of the state's fatalities involved run-off-the-road crashes. One of the most effective measures that can be taken to prevent vehicles from running off the road is rumble strips on paved shoulders. Engineers with the Iowa Department of Transportation are so confident in the safety benefits or shoulder rumble strips that in 2004 they designated milled-in rumble strips as a design standard for all new paved shoulder construction in rural areas.


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