cruise control

US /ˈkruːz kənˌtroʊl/
UK /ˈkruːz kənˌtroʊl/
"cruise control" picture
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

:
He set the cruise control to 70 mph on the highway.
Using cruise control can help save fuel on long drives.