We're driving a Tesla Model 3 refresh 2024, and it has the speed nag at every start up. It also has a lot of wrong speeds for portions of roads around our place.
Sometimes it's temporary speed limits that were set during road construction and then never went away, sometimes it doesn't understand that you left a type of road and went onto another one with a different default speed limit, it's pretty infuriating.
And that's a car that has cameras all around, onboard image analysis software and permanent internet connection. I can't imagine how that'd even work in cars with less capabilities.
Hilarious anecdote about this website: the owner once said there are tons of entries in the usage log of people misunderstanding the purpose of the website and inputting celebrities names to try to email them. :D