They exist just in case they need to crack down on you.

I always think of dog leash laws this way. In many places they aren’t enforced and the majority of dog owners let their dogs off leash. However, if the owner loses control of their dog and it gets into trouble, like biting someone or another dog, then the law can always say, you’re liable because your dog was supposed to be on leash.

I think the same goes for speeding and other laws. It basically puts liability on the lawbreaker if they take a certain risk. If nothing bad happens, fine. But, if something does, then it’s your fault.