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I don't know why any car would need crowd sourced speed limit sign reading.

Not “crowd” - as I said, just ten Teslas passing by should do.

They need it since the database is riddled with errors. Also, public GPS is not precise enough. Speed limits begin where the sign is. GPS is not that precise. In addition, the driver may need to begin slowing down well before the sign point.

The database should have the speed limit as a first piece of info.

But it doesn’t. And even if it did, the second point above (GPS imprecision) would still be a problem.

If the car sees a sign or road marking then that number replaces it.

I agree. Especially with the "if".

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.

Yes that would be a good idea. If it existed, which it doesn’t.

None of this involves any "learning" on the fly.

? The fleet can’t learn while it’s sitting in the garage. It has to be on the fly.
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