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>Is the speed limit emitted by LEDs?

The speed limit signs are LEDs. In real life they are much brighter than they appear in photos ('cause LED). https://maps.app.goo.gl/29Mg7HaqFeAi2L639

>Why is it ever different between winter and summer?

Because doing 120kph on an icy road or in heavy rain is a recipe for disaster. Northern Europe isn't California. The temperature ranges from +30C to -30C during the year.

> I as a human would ignore the signage

Why?

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> The speed limit signs are LEDs. In real life they are much brighter than they appear in photos ('cause LED). https://maps.app.goo.gl/29Mg7HaqFeAi2L639

Although those pictures probably illuminate (heh) the problem the Teslas are facing in determining the active speed limit.

> Why?

Because hamburgers, bald eagles, nonsensical date ordering, AR15s and imperial units demand it!

Do the signs flicker at 60 Hz, as shown in StreetView?

Aside: I'm not a fan of so many new cars with flickering taillights. I know most people can't see this effect, but many can.

I'm not sure what the frequency is but most likely 50Hz.

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