The Lunar Rover--or, Lunar Roving Vehicle--was a wire-wheeled, battery-operated vehicle used by the Apollo 15, 16, and 17 astronauts to explore the Moon's surface at greater distances than previously possible from the landing sites. Built by the Boeing Company, the Lunar Rover was 112 inches (310 cm) long, 45 inches (114 cm) high, and 480 pounds (218 kg) in weight. The rover was stored folded in the lunar module's descent. It was capable of supporting twice its own weight and could move at a speed of 8 mph (13 km/hr). The rover could ascend slopes up to 20 degrees and pass over one-foot-high obstacles and two-foot crevices.