It’s probably the end result of a Republican controlled legislature enacting laws to regulate nonexistent problems—I’m sure some state rep had a friend who owned a sign vendor so he pushed through a local ordinance requiring signage to declare that you can’t drive onto a road, all sold as blocking “illegals” from “getting drivers licenses.”
Sounds like your daughter needs to actually learn how to drive. I made scary mistakes when I was learning but the key was I learned to not make those mistakes. Take the phone out of the equation and let her learn the roads where she’s driving. Teach her to pay attention to her mirrors, what other drivers are doing (and not doing) and anticipate moronic behavior from other motorists.