A lunar rover or Moon rover is a space exploration vehicle (rover) designed to move across the surface of the Moon. Some rovers have been designed to transport members of a human spaceflight crew, such as the U.S. Apollo program's Lunar Roving Vehicle; others have been partially or fully autonomous robots, such as Soviet Lunokhods and Chinese Yutu. As of 2013, three countries have had rovers on the Moon: the Soviet Union, the United States and China.