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Probably because the number of Tesla's on the road is no where near large enough to be statistically good enough

No statistics needed. Speed limit signs rarely change. They just sit there.

Sorry. I was still thinking of the speed of traffic not the speed limit signs.
I don't know why any car would need crowd sourced speed limit sign reading.
The database should have the speed limit as a first piece of info.
If the car sees a sign or road marking then that number replaces it.
This could be a normal speed limit sign or a temporary one such as during construction.
The car should also take into account other factors to self impose a lower speed based on ability to "see" properly, such as in rain, snow, fog.

None of this involves any "learning" on the fly. Just executing the already learned ability to sense what it sees (i.e. inference).

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