I'm sort of sympathetic to that argument, but my observation has also been that most drivers are terrible at judging safe speeds for a given road. They go way

I'm sort of sympathetic to that argument, but my observation has also been that most drivers are terrible at judging safe speeds for a given road. They go way too slow when they don't need to (a gentle curve on a highway) and drive way too fast for conditions at other times (a narrow twisty two lane road with blocked sight lines and blind driveways).