This uses GPS data, not optical recognition
> Cars have been able to figure out when they're speeding for a while, thanks to GPS as well as traffic sign recognition
On one stretch of ring road (120km/h limit) my car consistently catches 80km/h signs set up for the exit roads.
Personally, I think this (speed-limit aware speed limiters) are going to trigger Congress to either fast-track legislation to disable them. Specifically, once the general public is aware of what's going on, they will stop buying new cars and car manufacturers will push on Congress.
I also think the legislation was written by someone who is very naive about engineering. What I remember is they tolerate a 10% error rate. If 10% of the cars are going too slow during rush hour, it's just going to create a major traffic jam.
It happened to me once while driving an ID4 on a 110km/h highway and it slowed down to 50km/h under the bridge.
And in any case GPS is not accurate enough for this. If you drive an access road right near a freeway GPS can not tell which one your are on.
GPS also doesn't work in many downtowns because of the tall buildings.