Kia Optima: Auto door lock/unlock feature (if equipped)

Impact sensing door unlock system (if equipped)

All doors will automatically unlock when an impact causes the air bags to deploy. ...

Speed sensing door lock system (if equipped)

All doors will be automatically locked after the vehicle speed exceeds 15 km/h (9.3 mi/h). And all doors will be automatically unlocked when you turn the engine off or when you remove the ignition ...

See also:

Overloading
WARNING - Weight Rating The gross axle weight rating (GAWR) and the gross vehicle weight rating (GVWR) for your vehicle are on the manufacturer’s label attached to the driver’s door. Exceedi ...

Overheating
If your temperature gauge indicates overheating, if you experience a loss of power, or if you hear a loud knocking or pinging noise, the engine has probably overheated. Should any of these symptom ...

To cancel cruise control, do one of the following
Depress the brake pedal. Depress the clutch pedal with a manual transaxle. Shift into N (Neutral) with an automatic transaxle. Press the CANCEL switch. Decrease the vehicle speed lower th ...