Rumble Strips

The Colorado Department of Transportation (CDOT) initiated a Statewide Rumble Strip project. The installation of shoulder rumble strips on 86.5 miles of I-25, 142.8 miles on I-70, and 61 miles on I-76 will result in continuous rumble strips on the interstate system throughout the rural sections of the state (excludes the Denver Metro area).

While rumble strips save lives and reduce property damage for motorists, they can be a problem for bicyclists riding on the shoulder. The Colorado bicycle community encouraged CDOT to identify a rumble strip design that is bicycle friendly. As a result, CDOT now uses a ground-in rumble strip, grinding the grooves to a depth of 3/8 inch (+ 1/8 inch). This depth provides a relatively high level of sound and vibration in motor vehicles and can be safely crossed by a bicycle. Also, the rumble strips are placed on the outside edge of the travel lanes’ edge line (no offset) to allow for maximum shoulder width unobstructed by rumble strips for bicyclist use.

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