Some railroad reg. requires a passenger train to decelerate with a jerk < 2 m/sec^3. Don't how or even if they do it on trains but it's a good idea to keep the jerk down when passengers are out of their seats and walking to an exit.
It could be done automatically on public buses to reduce tumbling down the aisle incidents. It would also reduce the multi tasking load on bus drivers trying to pull out into heavy traffic before passengers are seated..
The brake pedal would have an override, i.e., stomping all the way down, in case a pedestrian stepped out in front of the bus.
The number of elderly will soar along with fuel prices so this will save a lot of lives.