I don’t really believe that those AI guys are cheating. But this incorrect traffic sign shows that they’re pulling some traffic sign data in from someplace. There is no way:
a) That the AI reads a car tire as a 31MPH speed limit
b) That the AI would think that any US city would have a 31 MPH speed limit.
I caught this since for some reason on a recent drive through Trenton, Tennessee I didn’t drive past a speed limit sign. The town is known for it’s unique 31MPH speed limit. Usually locals have a 25 or 30 MPH speed limit.