Green light are dubious, you don't know how long until they shift, and thus you 'really should' decelerate a bit (driving school talk). With clearer signs, you could at least not fear having to stop in emergency. But even then, that won't stop someone to cross his red light ...

Roads signs are like compiler warnings, it's all cute and nice, but it's just characters on the screen anyone can physically ignore. Let's have roads with nasty speed bumps before all intersections, which are all annoying, impossible to cross fast, roundabouts. #haskell