Rumble Strips
![](https://webarchive.library.unt.edu/eot2008/20080918000436im_/http://safety.fhwa.dot.gov/images/garnish/rumblestrip.jpg)
Noise and vibration produced by shoulder rumble strips are effective alarms for drivers who are leaving the roadway. They are also helpful in areas where motorists battle rain, fog, snow, or dust. Rumble strips also help reduce highway hypnosis-a condition where white lines and yellow stripes on long, monotonous stretches of straight freeway can mesmerize and wreak havoc with a driver's concentration.