There was a speed limit change near where we live recently, from 55 to 45mph. Our AP2 car still show 55mph even though there a clear, brand new speed limit sign on that stretch. Our AP1 car can read the signs, though it does have a slight issue when it doesn't see a sign for a while, then it reverts to some old database. When traveling earlier this year through long stretches of Montana, I noticed the car would show 80mph when it saw the sign, then drop it to 70mph or even 65mph just because it didn't see a sign for a while (long stretches of highway between exists). Anyhow, lesson to be learned, don't rely on AP2 speed limit signs. I wish they would have a way to mark that little speed limit sign to indicate whether the speed limit shown is an actual sign the car saw or the computer pulled it out of some internet database. Until then, I watch out for signs yourself and don't trust what the car says, since I didn't see any ticket and insurance increase repayment guarantee in Tesla's terms, for when you get a ticket because the car told you an incorrect speed limit.