One of the features in Autopilot is Traffic Aware Cruise Control and Automatic Emergency Braking. It appears that in this case, they should have helped to preve

One of the features in Autopilot is Traffic Aware Cruise Control and Automatic Emergency Braking. It appears that in this case, they should have helped to prevent this. At the very least, provided you have not disabled it, it tends to produce a loud alarm to alert the driver of potential hazards. If this is indeed the case, maybe the problem goes beyond AP and extends to the safety features of the car... Notably, you can override the accelerator while driving on Autopilot. It warns you that Autopilot will not brake when you do this. This may be a potential factor.