rigsby:
you have to remember that the average numpty in the street thinks that his/her speedo is accurate and therefore drives at 3 to 5 mph under the appropriate speed limit . the fault is with the law allowing a discrepancy on the negative side . having said that there are still those that drive slowly in their role as self appointed traffic cops .
The problem is, as car speedos are not calibrated, it’s impossible to know how accurate it might be.
Therefore the only safe way to tackle any speed cameras is to stick to what the speedo says.