Re: The worst my Garmin has ever done
"The Sat Nav insisted on routing me back to one junction down from where I had left the road, instead of taking me back on three junctions down, which minimised the junction count as I was on one of those weird parallel-to-the-motorway A roads."
To be fair, I'd expect any SatNav to do exactly that in the same circumstances. It's routing you based on your destination and settings, eg fastest, shortest etc., absent any other information such as traffic info for the route. You can't really blame the SatNav because the traffic provider hasn't yet got or updated for the accident.