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Frequently Asked Questions

Q: How is Iowa installing bicycle-friendly rumble strips?

centerline rumble strip

A: Bicycle accommodation has been an issue in several states that have moved towards more widespread use of shoulder rumble strips. In an effort to garner input and advice from cyclists and address these issues up front, DOT officials worked with members of the biking community to come to a solution that includes a gap pattern for new rumble strips and wider six-foot shoulders on roadways where more bike traffic can be expected. Milled rumble strips will be placed in 48-foot sections, with a 12-foot break in between to allow cyclists to cross over. This pattern still provides 80 percent coverage of the shoulder with rumble strips and gives bicyclists the flexibility they need to move between the shoulder and roadway.


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