1 full second seems a lot of time, even at a very low speed, of 3.6 km/h or a little more than 2 miles/hour, that is 1 m/s, i.e. the car will travel a whole met

1 full second seems a lot of time, even at a very low speed, of 3.6 km/h or a little more than 2 miles/hour, that is 1 m/s, i.e. the car will travel a whole meter in that second of delay (to which you may actually need to add some delay for the reaction of the user), I would have thought that releasing the button would result in a nearly instant "emergency braking", after all there is no one in the car and even if it stops abruptly it wouldn't be an issue.