It must be because of the way the signs are put together. There is a truck speed limit sign on one highway we drive all the time and the car thinks that's the speed limit for all vehicles. It's laid out just like yours except it has the word TRUCK where the word SOUTH is on yours. I think that these cars get confused because of two piece signs.Note: This is NOT FSD beta... even with the Christmas update, this is STILL happening... for a couple years now.
Set AP to 65, and then I pass by one of these NOT speed limit signs... AP drops to a max of 47...
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The rest of my daily trip, I have to switch to cruise.
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I mean, they are close to the same thing...
We have speed limit for cars and trucks, side by side... you can watch the car bounce from one speed to the other for a few seconds before it decides on one.