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B-double

(Australia) A truck and trailer combination consisting of a prime mover coupled to two trailers without the use of a dolly-converter with a drawbar (A-coupling).

ˈbaɪdəbəl127 viewsLast reviewed Jun 29, 2026+ Add a definition
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Australia
#1·Apr 27, 2026AUS

(Australia) A truck and trailer combination consisting of a prime mover coupled to two trailers without the use of a dolly-converter with a drawbar (A-coupling).

Origin: So-called -"double" in Australia partly because of industry concerns about negative public attitudes to road trains. The "B" refers the load sharing axle group of the bridge "B" lead trailer with a 5th wheel coupling at the rear (between the trailers)- followed by a 5th wheel/turntable connected semitrailer as the second in the configuration. B-Doubles were initially developed in Canada, as B-Trains. The Australian freight road industry was able to persuade Governments to call them B-Doubles. This was to reduce potential confusion with road trains and also help overcome some public oppositi. Origin information sourced from Wiktionary contributors (CC BY-SA 4.0).
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