What is the purpose of an adaptive cruise control system (ACC) in motor vehicles?

Adaptive cruise control (ACC) is designed to automatically maintain a set speed by accelerating or decelerating the vehicle. It achieves this by monitoring the traffic ahead: it speeds up until the set speed is reached and slows down if a slower vehicle is detected. However, ACC does not always guarantee maintaining the legally prescribed safety distance; it attempts to keep a safe gap but this may vary depending on the system's settings and conditions. Therefore, the correct functions are independent acceleration to the set speed and independent deceleration when detecting slower traffic ahead.