Rumble Strips and Stripes - Federal Highway Administration (FHWA)
Rumble Strips are an effective countermeasure for preventing roadway departure crashes. The noise and vibration produced by rumble strips alert drivers when they leave the traveled way. Rumble stripes is the term used for rumble strips painted with a retroreflective coating to increase the visibility of the pavement edge at night and during inclement weather conditions.
The link address is: http://safety.fhwa.dot.gov/roadway_dept/pavement/rumble_strips/
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