To change the cruising speed

See also:

MT models
The key can be turned from “Acc” to “LOCK” only when the key is pushed in while turning it. ...

Automatic transmission models
Automatic transmission models The key can be turned from “Acc” to “LOCK” only when the select lever is in the “P” position. ...

Key lock-in prevention function
This function prevents the doors from being locked with the key still in the ignition switch. ...