Rumble strip

[Rihanna]

one of a set of raised strips on a road that makes a low sound when vehicles drive over it to warn drivers to slow down or change direction because they are getting close to something

[Rihanna]

Rumble strip in NASCAR. A strip of concrete added to the end of curbs that is designed to vibrate any wheel (and in doing so make a noise) that runs over them. This warns drivers they are near the edge of the track.