Rumble Strips

Strategy 18.1 A1—Centerline Rumble Strips for Two-Lane Roads (T)

General Description
 
Centerline rumble strips are similar to shoulder rumble strips. The purpose of rumble strips is to alert drivers who may inadvertently stray or encroach into opposing lanes. While this is a relatively new treatment, it has been implemented by some states, including Minnesota, Pennsylvania, Colorado, Delaware, Maryland, California, Washington, and Virginia. Other states, like Kansas, are still evaluating the use of centerline rumble strips in experimental installations.

Although there is no standard design, the rumble strip is generally wider than the center markings, extending into the travel lane by 5 in. to as much as 1.5 ft. In some states, the strips are continuous along the centerline; in others, they alternate with a smooth gap.

Since centerline rumble strips do not require changes in the overall cross section of the roadway, they would be compatible with other strategies such as shoulder rumble strips and horizontal curve improvements. This strategy, although fairly widely used, has not been sufficiently evaluated to be considered "proven."

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