In brief
The ACC can slow down according to the vehicle in front.
Useful to know
Adaptive cruise control adjusts the speed relative to the traffic and selected distance to the front car. When the road is free, the system can accelerate again to the speed set by the driver. [1]
Bosch distinguishes standard ACC and stop & go variants for low speeds. Not every system named ACC stops and departs under the same conditions. When choosing a car, check the specific range and the need for confirmation after a stay. This is a support function with acceleration and braking limits, and the driver continues to monitor speed and distance.
Sources
For further detail and to check the information: