How does the Audi A3's lane departure warning work?

I am interested in the technology behind the lane departure warning system in the Audi A3. How does it function and how effective is it in preventing accidents?

The Audi A3's lane departure warning system utilizes cameras to monitor lane markings on the road and sends out visual and auditory alerts if the vehicle drifts out of its lane without signaling. It also has the ability to help steer the car back into its lane if necessary. In my experience, it has been quite effective in preventing accidents and keeping the car in its designated lane.