A B-double is a combination of a prime mover towing two semi-trailers all connected by B-couplings.

A route that is approved for a B–double can be used by a B–double with the same or shorter overall length (e.g. a 19 metre B–double can operate on 23 metre and 25 metre approved routes; a 23 metre B–double can operate on a 25 metre approved route).

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National Notices

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