Shouldnt collision detection override the operator? The operator shouldnt be allowed to drive the bus into another bus, wall, or any other obstruction.
Tesla seems to think not. As long as the accelerator pedal is depressed by the human driving, it will NOT apply any automatic braking. It will beep loudly and flash messages that you are about to hit something, usually with plenty of time for the driver to react. But, if the driver keeps their foot on the accelerator the car will not attempt stop.
I don't know what level of autonomy these buses claim to have, but Tesla is only level 2. With level 2, the driver is expected to be paying full attention and be prepared to take over all the time, and with that I believe the car should NEVER override a driver's decision on level 2 autonomy. I also think that no level of autonomy should override a driver's decision except maybe level 5.