What is Audi's active lane departure warning and how does it work?

I've heard that the Audi A8 has an advanced lane departure warning system. Can anyone explain how it differs from a standard lane departure warning system and what sensors are used?

The Audi A8's active lane departure warning system uses a combination of cameras and sensors to detect the car's position within the lane. It also monitors the driver's steering patterns to determine if the car is drifting unintentionally. If so, it will provide an audible and visual warning to the driver.