On the other hand, I have been confused by fairly simple changes to roads such as a two way street being made one-way (which a decent satnav would have been upd

On the other hand, I have been confused by fairly simple changes to roads such as a two way street being made one-way (which a decent satnav would have been updated to know about as soon as the change was gazettes) or roadworks closing off a road that i regularly use (again, autonomous system would have been updared based on gazetted road closures).