Somewhat related anegdote: in France there one of the option for toll roads is a device that handles a payment for you and opens the barrier as the car approach

Somewhat related anegdote: in France there one of the option for toll roads is a device that handles a payment for you and opens the barrier as the car approaches (it works up to 30 km/h). A friend of mine was doing that in a new car with some pedestrian detection system that decided to detect the barrier as a human and slam the brakes to the complete stop. From what I've heard it was not exactly pleasant.