Which technology does the Audi A8 use for its semi-autonomous driving feature?

I am interested in understanding the inner workings of Audi's semi-autonomous driving feature. Can someone provide insight into the technology being used in the A8 model?

The Audi A8 uses a combination of radar, cameras, and ultrasonic sensors to enable its semi-autonomous driving feature. It utilizes a system called Traffic Jam Assist to maintain speed and distance from other vehicles while driving in heavy traffic.