If this law were to enforce the speed limit by enforcing it in the motor control system there would still allow for unlimited speed on those stretches.

Your freedom to go faster than the speed limit also interferes with other freedoms btw. for example the health of people who live close to roads, the bodily integrity of people who might fall victim to the accidents caused by it etc.

If we build the roads correctly (e.g. like in more modern european places, many places in the Netherlands) speed limits become less relevant, because the shape of the street itself will limit how fast any sane person would go (not to speak of speed bumps).

So if you find yourself constantly enforcing speed limits, maybe there is an impedance mismatch between the way your road feels and the limit you slapped onto the traffic sign?

The obvious solution is to change the road, which might also come with added benefits (better for pedestrians, people on bicycles, therefore better revenue for local shops, restaurants and cafes etc).

Quite frankly I'd have no problem if my car enforced a speed limit, if the speed limit matches the street. Going 30 in a narrow (and I mean european narrow) street feels totally appropriate. Going 30 in what could be a highway not so much.