Smart cars

There were two vehicles parked beside an old, white two-story house. One had the general design of a subcompact, except all of the angles of its frame were at ninety degrees, so that it had a box-like appearance. The other was a large SUV and was parked behind the smaller car. Both were covered by white polyester fabric, stretched tautly to their frames.
Though there were no people in either vehicle, Rock watched the SUV begin to push the car in front. Within a minute or two, it had pushed it around the block. Shortly after the vehicles had returned to their original position by the house, the SUV pushed the car into the lawn.
That was when the vehicles' owners arrived, each longtime acquaintances of Rock's. The car belonged to Mark Bison, a forty-year-old sportswriter who worked for a chain of small weekly newspapers near Little Rock, and the SUV to a couple named David and Christine Maloney.
Rock told them what he had seen, but they reacted as if it were not at all surprising.
"That's one of the problems with this smart-car technology," Bison said.
David laughed. "It's as if they have minds of their own," he said.