This sounds like a fairly close representation of the way the speed limit is enforced in Ontario...[QU OTE=Yggdrasill;219581]Luckily there are some safety margins. The speedometer usually underrepports by 5-10% and the safety margin is something like 5-10% as well. I've never gotten a ticket when driving around 85-88 km/h (on the GPS) in an 80-zone, while the speedometer shows around 95 km/h. If the cops say you were going at 16 km/h over the speed limit, you were probably going 20-25 km/h over the speed limit, and your speedometer would have shown something like 30-35 km/h over the speed limit.
Also, they never stop people who are just following the traffic, they only stop the worst offenders. If you're just following traffic at X km/h over the speed limit, the thing to look out for is speed cameras, because they will ticket everyone. (Though usually traffic flows past a speed camera at something like 20% under the speed limit.)[/QUOTE]