I ain't Spartacus,
At this point, many cars are pretty good at reading speed limit signs, and none of the cars I have used relied pm, or probably even bothered with, speed-limit databases. That said, speed limit signs can be deceiving, as some of them will have a bit "55mph" sign and small print saying that it applies only to trucks or vehicles hauling trailers, so cars can't take them too seriously until they can start reading the small print.
But, the cameras do work well for urban driving, and Teslas, at least since 2020, have been limiting such driving while using autopilot to 5mph or less over the detected speed limit.
Biting the hand that feeds IT
