You’re describing reckless driving. Driving faster than the mandated speed limit is not necessarily reckless. And there are a hell of a lot of laws that can be made that aren’t immoral, but that doesn’t make them any less stupid.
It’s all about creating guilt among the average law-abiding citizenry by passing enough laws where EVERYONE is a criminal in some way or another.
I refuse to believe that THAT is sin. God declares what sin is, not bureaucrats.
That is true. However, I don't think one needs to be "reckless," a rather strong word, to be "not sufficiently concerned with the harm I might do."
Driving is a matter of habits, and if people develop the habit of exceeding the speed limit, passing unsafely, or failing to stop at stop signs, they are a threat to others.
It comes down to whether a person chooses to think of herself first, or to consider others first, even at a cost to self. Driving the speed limit, as a rule, does no harm to the self, and it decreases the risk of harm to others.