Poor knowledge about the picture language of german visual guidance systems is shown at Nürnberg Airport. The intention was, to advise the passengers, that at a certain part of the airport there is no possibility for wheelchair-users to change floor, because there are only stairs but no elevators.
However they used the wheelchair icon in combination with the “prohibited”-traffic sign, which is not only correct with regard to contents. Sascha Lobo wrote a cheerfull comment on this in his book Riesenmaschine.
Picture found at Riesenmaschine