> and obviously police and ambulances (and fire trucks) doing their jobs don't have to follow the sign.
Cue ambulance crashing through a wooden bridge over a river because it was never intended to carry the weight, or getting stuck in a tunnel, driving over pedestrians that can't get out of the way because there is no space left, ... . Blindly ignoring a rule because you can is not always a good idea. You might be able to ignore the rule, but you can't ignore the reason why it was put in place.
Cue ambulance crashing through a wooden bridge over a river because it was never intended to carry the weight, or getting stuck in a tunnel, driving over pedestrians that can't get out of the way because there is no space left, ... . Blindly ignoring a rule because you can is not always a good idea. You might be able to ignore the rule, but you can't ignore the reason why it was put in place.