To change the cruising speed

See also:

Cruise control set indicator light
This light illuminates when vehicle speed has been set. ...

Shift-up indicator light (STI)
While selecting the Intelligent (I) mode of SI-DRIVE, this indicator light illuminates and informs the driver about the upshift timing for fuel-efficient driving. ...

Engine low oil level warning light
The engine low oil level warning light illuminates when the ignition switch is turned to the “ON” position and turns off after approximately 2 seconds. This light also illuminates when the engine ...