Stupid laws - I saw one of those TV programmes that follow the Motorway Police around and they saw someone doing whatever it is you can't do anymore this week - eating a banana, scratch your knee while driving etc. - anyway, they were actually in pursuit of another vehicle so couldn't pull this guy over. Instead, the non-driving policeman suggested they pull alongside and the non-driving policeman could tick him off, before speeding off in pursuit of the other car.
So here we have someone doing something exceptionally trivial, being forced to look sideways out of his car and try and comprehend what all the mouthed words and gestures might mean. All this at 70 miles per hour on the motorway.