You were of course right, you have redundancies for everything in the car. Building and constructing stuff actually is easy, but getting the TÜV is hard. The TÜV is the goods vehicle test certificate and they have strict rules and regulations. If you go to them with a car that has no redundancies or failsafe in case of a malfunction of the auto-pilot and that then goes hiwire would be totally devastiating for your reputation forever. I remember when Mercedes builed the A-Klasse and during testing it fell over on the side while driving a curve. Things like that should never happen and it's what you have to do as a good product manager thinking of all the consequences.