Never let it be said that the Germans haven't done their part for literacy. Besides providing the world with the works of Goethe, Brecht and Werner von Braun, Deutschland also gave rise to industrial conglomerate Siemens, who've developed a system that reads speed limit signs and can adjust a vehicle's speed downward at the driver's discretion to stay within limits. The all-seeing eye cross checks the electrosensory stimulus it takes in with GPS data to ensure it's not wonky. We imagine this would be a highly-useful invention in a Gatso-riddled society.
Cars to Automatically Detect Speed Limit [Driving.ca]
If You Can't Buy It, Build It: Wanky The Safety Cat [Internal]