Either the speed-sensor signs in my city are all tuned too high, or I’ve never had access to a car with an accurate speedometer - I’ve never driven through one that didn’t read about 10 km/hr over what my speedometer said.
The ones they have on the highway have matched what my speedometer said, so if it’s a speedometer issue, then the cars I’ve used have speedometers that are only inaccurate at the low end…
