B-Double

A Prime Mover which pulls two semi-trailers, which are linked by a fifth wheel and can be up to 26 metres long. The fifth wheel coupling can be found at the end of the first semi-trailer and provides more stability to the unit than a road train can. The lead semi-trailer has a turntable at the end, so it can connect to another semi-trailer without a converter dolly, which a road train does need.