Aren't designers supposed to use risk mitigation when designing information systems ?

Which if I remember correctly proposes the theory that you can't program the end user.

Perhaps if they included the possibility that a real humans would be driving the vehicles, SatNav would be condidered a safety critical system and wouldn't be sitting on so many dashboards.

As humans are so notoriously unpredictable, perhaps the system designers should include folks who can't read a map/drive a car as part of the design team, chimps spring to mind.

Alf