Subaru Impreza 2017 Owner's Manual page 56

Adaptive Cruise Control
The automatic braking function is released gradually approximately 2
seconds after stopping and the vehicle starts creeping forward. Be sure to
depress the brake pedal and stop the vehicle completely.
Vehicles in front in the same traffic lane are detected by the stereo camera
within a distance of approximately 360 ft (110 m) in the forward direction.
However the detection distance may be reduced depending on the traffic
environment, driving conditions, and conditions of the vehicle in front.
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CAUTION
NOTE