The boy's guardian notified police that he was missing Sunday evening. Minutes later, the boy was spotted on a suburban road about 25 miles southwest of Pittsburgh.
Police say the boy drove up to 85 mph westbound on Interstate 70, swerving wildly between lanes. He got off the highway briefly, only to get back on going eastbound.
Officials say he then exited the interstate, hit a police cruiser and smashed into a utility pole.
The boy suffered a head injury that was not life-threatening.