Misdirected off motorway
The first time I was instructed to leave and join the M50 towards Ross-on-Wye: I decided to ignore that.
Some time later I was directed to exit onto the Wolverhampton road, and because I knew there were long hold-ups ahead, I took the turning. When I reached the roundabout over the motorway I was instructed to take the second exit.
Guess where this took me; yes, down to the motorway I'd just left. Tell me what algorithm is responsible for that bit of stupidity. AND it takes 4 hours to download the maps!