Rumble strips use vibration and sound to alert drowsy or inattentive drivers that they are

Rumble strips are a series of indented elements installed on a paved roadway shoulder near the travel lane, on a two-lane roadway near the center line, or in a lane of traffic approaching a stop sign or signal. Rumble strips use vibration and sound to alert drowsy or inattentive drivers that their vehicles have left the travel lane or are approaching a stop sign or signal.