cruise control
US /ˈkruːz kənˌtroʊl/
UK /ˈkruːz kənˌtroʊl/
1.
a system in a car or other vehicle that allows the driver to set a constant speed, so that the vehicle maintains that speed without the driver having to press the accelerator pedal
:
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He set the cruise control to 70 mph on the highway.
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Using cruise control can help save fuel on long drives.