A friend had a nice job of driving BMWs for a manufacturer of such a system (it was early 2000s and the system was more embedded than Android/Linux). One test was setting a calendar alarm (because yeah of course the BMW needs an on-board calendar), and while cruising down the highway, wait for the alarm to go off, and then open a door. He said a colleague did this and the system crashed and went dark...

I suppose even driving 20kmh should trigger the "door open!" alarm.