rumble strip
US /ˈrʌm.bl̩ ˌstrɪp/
UK /ˈrʌm.bl̩ ˌstrɪp/
1.
a series of grooves or raised strips across a road, designed to make a noise and vibrate a vehicle when driven over, to warn drivers of a hazard or to encourage them to reduce speed
:
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The car vibrated as it drove over the rumble strip, alerting the driver to the upcoming stop sign.
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Many highways have rumble strips on the shoulders to prevent drivers from drifting off the road.