This already happens occasionally with regular drivers: https://www.telegraph.co.uk/news/uknews/road-and-rail-transport/11138390/Drivers-tricked-by-fake-40mph-s

This already happens occasionally with regular drivers: https://www.telegraph.co.uk/news/uknews/road-and-rail-transport/11138390/Drivers-tricked-by-fake-40mph-speed-limit-signs.html https://www.telegraph.co.uk/news/uknews/road-and-rail-transp... "Pranksters blamed for speeding offences after drivers caught out by 40mph signs in 30mph zone" Ironically, current Teslas are largely immune to this as they use a database of speed limits.