True, but it's a dangerous precedent. The fact is that a lot of law in areas such as traffic, waste management etc is basically meant to be fluid and a deterrent; if everybody that littered where it was illegal, drank from open containers where it was illegal, fly-tipped or sped was instantly caught, then we'd just have tonnes of people in prison for relatively minor offences.

I think there's a desirable degree of pragmatism to be favoured in lieu of unbounded technological utopianism on this point.

Philosophically speaking, no one will be saved. We are all basically dying. Of course it would be nice to reduce traffic deaths, but we should carefully consider in what way our actions will affect society.

We should not assume this will only affect how people behave in traffic, as well. Other offences will likely also be included.