How does the active lane assist feature work in an Audi A6?

I've heard that the Audi A6 has a feature called active lane assist. Can someone explain how it works and if it's worth the additional cost?

Active lane assist is a great feature and definitely worth the cost. It uses cameras to detect lane markings and helps steer the vehicle back into the lane if you start to drift. It can also adjust the steering if you are about to change lanes without using a turn signal.

I've found active lane assist to be very helpful in preventing accidents. It gives you a gentle reminder if you start to drift out of your lane, but it won't take control away from you completely. You still have ultimate control over your vehicle.