Grooves cut into the edge of the road
Noisy ridges along the hard shoulder or the centreline, which make the whole car shudder.
Category: Streets & signs
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Feature. They are an alarm for sleepy drivers.
Rumble strips create a sudden noise and vibration when a tyre crosses them. The US Federal Highway Administration promotes them to alert drivers who are drifting off the road.
Source: Rumble strips, US Federal Highway Administration.