How does the Audi A8's adaptive cruise control work in low visibility conditions?

I'm considering purchasing an Audi A8 and have heard about its advanced adaptive cruise control system. Can someone explain how it works in situations with low visibility, such as heavy rain or fog?

The Audi A8's adaptive cruise control uses radar and cameras to measure and maintain a safe distance from the vehicle ahead, even in low visibility conditions. If the visibility is too poor for the cameras to function properly, the radar alone is still able to adjust the car's speed and maintain a safe distance.