Egyptian Driving Clue

A friend of mine once waved a hand at a chaotic flow of cars down the streets of Cairo and blamed it all on donkeys. I was puzzled as there were no donkeys present. No, she explained, it isn't the donkeys who are here but the donkeys that the drivers' grandfathers used to drive who are to blame. Donkeys are smart, they learn where to go, and they take care of themselves and their carts with out input from the driver. When Egyptians get behind the wheel of a car, they act as though the car were as smart as the donkey...but it isn't.