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@davidzipper We do this in the EU already.
Now if you just tell me how cars are supposed to reliably tell the speed limit.

Analysing video for signs is highly reliable (in the data science way), >90%.

GPS location (does have a problem with parallel roads, so is that the city road inside the neighbourhood, or the interstate?) + map data (needs constant updating and will never we 100% up to date).

So yes, it's one cool gadget more that in practice one needs to turn off after powering on a car.