A state trooper noticed a car driving along the highway very slowly. His radar clocked the vehicle at 22 mph. The trooper, worried that the driver might be in trouble, turned on his siren and brought the slow moving car to a stop. The driver was an elderly man. In the back seat sat two old ladies. both trembling with fright. What's wrong , officer? asked the driver. i was driving the speed limit, It was on the sign back there. The troper realized what had happened. Sir, that wasn't the speed limit sign, that was the route number. The speed limit is 65. You're on highway 22. Oh, the man said with a nod. Sorry about that. The trooper looked into the back seat. Are they all right? Those are my sisters, said the driver. They'll be fine. We just got off highway 175.