In Aussie our B doubles are allowed on certain roads outside the city centres, they are up to 27.5 Metres ( over 90 feet) long our B triples are permit only on major Roads with escorts are 36.5 meters almost 120 foot long with permit and escorts our Road Trains on outback Public Hwys are up to 53.5 metres long nearly 176 foot long, on private mining roads some combinations have 8 or more 8 axle trailers the most common is the 4 x 8 axle combinations ,