Whenever a policeman waves my car down, a flicker of indignation rises in me, tinged with a trace of ironic amusement. I was taking a shortcut yesterday morning when a constable stopped my car right in front of a big ditch on a narrow rural road. It was a strategic point: no one could speed away ignoring the police because of the rainwater-filled ditch that spanned the entire width of the road ahead. Another constable came with a breathalyser and asked me to blow into it wh...