Fact Sheet: Over 50 percent of California's fatal crashes are a result of roadway departure. This application provides an audible warning and physical vibration to alert drivers they are leaving the roadway. The application of rumble strips or stripes has shown good results in reducing run off the road (ROR) crashes. Most rumble strips and rumble stripes are milled into the pavement and are mainly installed along the centerline or shoulder. Rumble stripes are painted over with retroreflective striping to increase visibility.