To change the cruising speed

See also:

Windshield wiper and washer switches
The wiper operates only when the ignition switch is in the “ON” or “Acc” position. ...

Shift lock function
The shift lock function helps prevent the improper operation of the select lever. - The select lever cannot be operated unless the ignition switch is turned to the “ON” position and the brake p ...

MMT
Some gasoline contains an octane-enhancing additive called MMT (Methylcyclopentadienyl Manganese Tricarbonyl). If you use such fuels, your emission control system performance may deteriorate a ...