
The crawler-transporters are a pair of tracked vehicles used to transport spacecraft from NASA`s Vehicle Assembly Building (VAB) along the Crawlerway to Launch Complex 39. They were originally used to transport the Saturn IB and Saturn V rockets during the Apollo, Skylab and Apollo–Soyuz programs. They were then used to transport Space Shuttles....
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http://en.wikipedia.org/wiki/Crawler-transporter

An immense vehicle, adapted from earth-moving machinery, which carries the Space Shuttle, and previously the Saturn V, on a crawlerway from the Vertical Assembly Building to one or other of launch pads 39A and 39B at Cape Canaveral. The crawler-transporter is 40 meters long and 35 m wide, weighs 2,7...
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http://www.daviddarling.info/encyclopedia/C/crawler-transporter.html
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