A roof rack fastens securely to the roof of a vehicle and is a handy way to travel with a bicycle or other recreational equipment. This photo shows a man loading his mountain bike onto the roof rack of his sports utility vehicle.
www.BikeRacks.us/roof-rack.htm
Bicycle Roof Rack (Photograph)
Car-mounted bicycle racks may be fastened to the trailer hitch, strapped to the rear of the car, or mounted to the roof. Roof-mounted racks may be used to transport bicycles as well as luggage, skies, kayaks, canoes, and other recreational equipment.