How does the lane departure warning system work?

I've noticed there is a lane departure warning system on my Audi A7. Can you explain how it works and if it's reliable?

The lane departure warning system in the Audi A7 uses cameras to detect the markings on the road. It then alerts you if you start to drift out of your lane without using a turn signal. It's important to note that this system is meant to assist you, not replace your own judgement. So always stay alert and in control of your vehicle.

I've had a lot of experience with the lane departure warning system in my Audi A7 and it has been quite reliable. However, it's important to keep the cameras clean and free from obstructions such as dirt or snow for the best accuracy.