[mgoetzke]

It definitely reads the signs. That has been proven many times over (with temporary signs etc, or handheld signs) visualized correctly in the 3d view, but it decides to ignore them often. The assumption is an override from the Maps, but that alone does not explain everything.

[vegardx]

I might be wrong, but I think this is where a lot of the misconception stems from. In Norway it also shows the (usually) correct visualization, but it never use it. People have done a lot of testing and it seemingly always use map data. But this might be different in different regions. From my understanding this is where a lot of the "phantom breaking" on highways comes from. The map data shows a temporary slower speed sign due to previous construction.

[averageRoyalty]

In Australia, a lot of buses have a 40kmph sign on the back to show you should pass the bus at 40 when stopped - but it's laid out and coloured the same as road signs.

Every time I'm behind a bus in my Tesla, it reads the sign on the bus, displays it on the scren as the current limit, and sometimes (arbitrarily it seems) if I have autopilot on it reduces the maximum allowed speed to 40.

I can't speak for the logic run elsewhere, but AU Teslas for sure use it.