There was a great story, recounted by Jay Leno (probably in his column in Octane?) where he tells how he comes screaming round a corner in his MTW to see a police car with a mobile speed trap. He duly pulls over and waits for the Cop to approach (this is the US of A after all). After a few minutes waiting no-one approaches, so he walks back to the Cop car and asks why they are waiting.
"for what Sir? You were doing 42MPH and the limit is 50"
The beauty being you think you are like Richard Hammonds "driving God" (TG Bowler episode) but actually only just over a pootle
Parahphrased through memory recall but the gist is correct, and I thought it was both amusing and interetsting.
Just watched the vid and he recounts the same story 
At least I got it reasonably accurately.