I came across an official road sign in Wales telling drivers to ignore their sat nav and not turn off through a village. It even had a symbol of a satellite above a car. Wish I'd got a photo.

Found it! It is lorries it is directing.

http://www.boingboing.net/2007/08/31/uk-village-posts-ign.html

Also a general article here, showing a yellow temporary text-only sign:

http://www.dailymail.co.uk/news/article-436983/First-ignore-sat-nav-roadsigns-up.html

At least OSM map is correct. Maybe they can change sign to 'go to openstreetmap.org for an updated route'

My thoughts exactly nmixter. If I had had a texter at the time, I'd added that promptly :) Oh, and the additional; 'Free -working- Garmin map of Norway here: www.frikart.no'

Interesting problem, same I did a comparison of google maps with satelite images and OSM in my area, the google maps are mainly TeleAtlas (TomTom), and that is plainly wrong. In other words, OSM give you a safer and correct route even though much data still is missing, damn I am mapping the area all alone.