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Every Saturday on the Great Northern Highway leading out of Perth is known locally as "Super Saturday," as it is the only time when very wide loads are permitted on the highway in this area. The mining boom in the Northwest of Western Australia has seen a huge jump in the number of oversize loads mostly mining dump trucks, excavators, and items of prefabricated industrial components. Most trucks travel in tandem with one convey containing the Dump bucket, and another convoy carrying the dump truck chassis minus wheels. A third convey usually follow with the wheels. Large excavators are broken down and transported in 3 components. The tracks alone of a large one weigh 120 tonne and require two trucks to haul them. The Brockman Bridge is a narrow bridge just south of the Bindoon township and it is chaos there at times as an endless procession of these trucks with their attendant pilot and police escort vehicles do battle with the hundreds of returning empty road trains that frequent the highway. Background music is reproduced under license from Maganatune, "Industry" by Cavalcade.