B Double Vs Road Train. ≤ 30.0 metres 4 4 4 4 4 4 4 4 4 2 20.0t 20.0t 16.5t 6.0t1 gml total combination mass. B double b double, or heavy truck and trailer 10 groups = 4 and axles > 6 17.5m to 36.5m > 6 5 or 6 double road train double road train, or medium articulated vehicle and one dog trailer (m.a.d.) 11 groups = 5 or 6 and axles > 6 large combination over 33.0m > 6 > 6 triple road train triple road train, or heavy truck and three trailers 12 groups.
A road train is a class 2 heavy vehicle (hvnl s136 (a) (ii) (b)) that consists of a motor vehicle towing two or more trailers (excluding converter dollies supporting a trailer). Not susceptible to yaw except in extreme situations. The second trailer is a dog trailer.
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Finally, there is a light at the end of the tunnel. Changes in edition 3.0 include: Not susceptible to yaw except in extreme situations. The fifth wheel coupling is located at the rear of the lead, or first trailer and is mounted on a tail section commonly located immediately above the.