Mobile speed cameras are increasingly being used by the police to enforce speed limits, but how accurate are they?
I missed the program but the full write up on the web looks interesting, showing how a small wobble can make a wall be clocked at 58MPH. The MD of the company that makes them blusters that errors are impossible - I'm more impressed by someone who "has spent twenty years being a professor of industrial instrumentation (possibly the only professor of industrial instrumentation)" - and his verdict?
The only reasonable conclusion you could come to in view of all these caveats is that thousands of motorists have been wrongly convicted, some of them losing their livelihood as a result.
This is one of those cases in which it is difficult to understand why the fundamental design decision was made. Laser Doppler velocimetry has been successfully applied to the measurement of speeds of everything from blood corpuscles to rolled steel. Why throw it aside for a mechanism with such obvious contradictions?
it wouldn't be because it increases the conviction rate, would it?