Here in Belgium we have the automatic speed limit shown in the HUD but also with the self- driving taking it into account. And when you use GPS navigation it automatically knows when to brake (turns, roundabouts, steep curves...)
Automatic speed limit and signs recognition is a must with all speed trap cameras we have.
I can only assume that they don't want to do by default in the US to avoid any legal claims in the event it did not recognize it or similar.
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