Mike,
There's two types of B-Double you have photographed - the 19m ones are unrestricted access while the 25/26m ones are restricted access.
The restricted access (25/26m) B-Doubles are not allowed east of Lithgow - they usually send semis down from Dubbo to Sydney anyway! The unrestricted access B-Doubles are allowed to use all roads in NSW while the restricted access B-Doubles are mainly restricted to the Newell and Hume Highways!
Joe
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