I'm sure the accuracy is lumpy - I was paying attention to Google on a recent road trip and it was wrong a few times.

I mean Google is regularly wrong within a block of my house, and was definitely wrong on my trip (they listed the speed limit 20km/h higher on the freeway than was legal). But the camera based system was also wrong on part of every trip. It misinterpreted signs regularly!

Limits only applicable in snowy conditions were applied in summer. Signs denoting the end of construction limits were missed. And it didn't understand some of the conventions in the European country I was in (although it was an Opel Astra, made for that market).

Ultimately, I agree with your point that cars are dangerous and people shouldn't be allowed to drive them unsafely. This particular tech isn't super reliable, is all. Plus I am skeptical of the political viability of the plan.

Oh, it's political suicide for sure. Car cultists cannot bear the suggestion of any regulation on speed .