Automated mapping seems like it ought to be able to solve this. Even if the cameras are less good than a human, all the other cars' cameras could help immensely

Automated mapping seems like it ought to be able to solve this. Even if the cameras are less good than a human, all the other cars' cameras could help immensely. Why isn't every Tesla tracking all the lanes it can see, and the behaviour of every option at every exit, and flagging cases where one of the other lanes does something weird, or dangerous, half a mile later?