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Car manufacturers forget about their cars infotainment systems as soon as they sell them. I just drove home on a road yesterday that was totally missing from my Toyota's built-in map. Even if they offer a map update, it's probably already out of date and they probably charge for it. I'm sure the speed limit data is going to be equally fresh and easy to update.

This is why I refuse to buy a new car without android auto/carplay. I feel that’s a core essential feature at this point, at least for new cars.

The number of times I've looked at the speed limit my car thinks it is supposed to be and seen 80 on what is effectively a residential road...

Or that the highway near my house that the car seems to think is 35.

Barring also adding some sort of managed database owned by the state I don't see this being remotely viable.

Many cars use vision systems to identify the current speed limit, eliminating the need for a database.

> I can only imagine some future manufacturer’s database would be even more out of sync.

Well that will be illegal then.?