Four LRVs were built, one each for Apollo missions 15, 16, and 17; and one for spare parts.
The rover was first used on 31 July 1971, during the Apollo 15 mission. This greatly expanded the range of the lunar explorers. The range, though, was operationally restricted to remain within walking distance of the lunar module.....just in case the rover broke down. No RAC on the moon.
The rovers were designed with a top speed of about 8 mph (13 km/h), although Eugene Cernan recorded a maximum speed of 11.2 mph (18.0 km/h), giving him the (unofficial) lunar land-speed record.