An 11-year-old boy who took a city bus on a seven-block joy ride bailed out of the moving bus before it collided head-on with an automobile, injuring the driver, officials said.

The boy, who was charged with juvenile delinquency, was treated for head and eye bruises.The youth climbed inside the 40-foot-bus at a maintenance yard in the borough of Brooklyn on Monday morning, said Bob Slovak, a spokesman for the Transit Authority.

The boy pulled the bus into the street, where it smashed into the side of a parked fire engine, crashed into the side of a parked truck, collided head-on with a car and then careened into a pillar beneath elevated subway tracks.