Lunar rovers (or Moon buggies) were used on the last 3 Apollo missions. A rover allowed astronauts to explore further and carry more equipment. It had a 90 inch wheelbase and a top speed of 22 kph.
Apollo Lunar Surface Journal
There is still much to learn from the Apollo 17 mission. Moon Zoo needs your help to explore the Apollo 17 landing site. Celebrate the anniversary with us. Go to http://www.moonzoo.org/ and start clicking! Follow “live” mission tweets from @moonzoo