Waiting in a lay by ready to catch speeding drivers, a Police Officer sees a car puttering along the A22 at well under the 30 mile per hour limit. Says he to himself: "This driver is just as dangerous as a speeder!" So he turns on his twos and blues and pulls the driver over. Approaching the car, he notices that there are five old people,two in the front seats and three in the back...wide eyed and white as ghosts.The driver, obviously confused, says to him "Officer, I don't understand, I was doing exactly the speed limit! What seems to be the problem?""Sir," the officer replies, "you weren't speeding, but you should know that driving slower than the speed limit can also be a danger to other drivers.""Slower than the speed limit? No sir, I was doing the speed limit exactly, twenty-two miles an hour!" ......the old man says a bit proudly. The Police officer, trying to contain a chuckle explains to himthat A22 is the road number, not the speed limit.A bit embarrassed, the man grins and thanks the officer for pointing out his error."But before I let you go, sir, I have to ask, is everyone in this car OK? These people seem awfully shaken, and they haven't made a sound this whole time," the officer asks."Oh, they'll be all right in a minute officer. We've just come off the A120."