A traffic officer pulled alongside a speeding car

A traffic officer pulled alongside a speeding car on the motorway. Glancing into the car, he was astounded to see that the young lady, who was driving, was knitting.Realising that she was oblivious to his flashing lights and siren, the policeman wound down his window, turned on his loudspeaker and yelled, ‘PULL OVER!’

‘NO’, the young lady yelled back, ‘IT’s A SCARF!’