While driving on a road that has lane markers, this system recognizes the lane markers using a camera as a sensor to alert the driver when the vehicle deviates from its lane.
If the system judges that the vehicle has deviated from its lane, it alerts the driver using a buzzer and indications on the multi-information display.
Camera sensor

Turning the lda system onCustomization
Your vehicle includes a variety of electronic features that can be
personalized to your preferences. The settings of these features
can be changed by the meter control switches, on the audio system
screen or at your toyota dealer.
Customizing vehicle features (audio system screen)
Audio system ...