Road Train is the largest and heaviest road-legal vehicles in the world, with some configurations topping out at close to 200 tonnes (220 short tons). The majority are between 80 and 120 t (88 and 130 short tons). Two-trailer road trains, or "doubles," are allowed in most parts of Australia, with the exception of some urban areas. Three trailer road trains (triples) operate in western New South Wales, western Queensland, South Australia, Western Australia 
and the Northern Territory, with the last three states also allowing AB-Quads (3.5 trailers).Road trains can be unwieldy, and driving and maneuvering them safely without unduly obstructing traffic is only possible because of the sparse traffic and extremely flat and straight terrain through the Australian outback. Strict regulations also apply regarding licensing and driving experience. The multiple dog-trailers (defined below) are unhooked, the dollys removed and then connected individually to multiple trucks at "assembly" yards when the road train gets close to populated areas.
Road trains are used for transporting all manner of materials, with livestock, fuel, mineral ores and general freight the most common. Their cost-effective transport has played a significant part in the economic development of remote areas, with some communities totally reliant on a regular service.
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