Lock the throttle when cruising at constant speed.

When the switch is turned on at the speed required by the driver, the vehicle will automatically keep the speed without stepping on the accelerator, so that the vehicle can run at a fixed speed. At present, many models have adopted this device. When driving on the highway for a long time, the driver does not have to control the accelerator pedal, which reduces fatigue. Nowadays, not only automatic transmission models, but also many manual transmission models have constant speed cruise function.