As per NHVR regulations, General Mass Limits (GML) apply to all heavy vehicles and heavy vehicle combinations that operate on Australian roads.
GML describes the mass limits permitted for all types of heavy vehicle axle groups, unless you have an exemption under Heavy Vehicle National Law (HVNL).
The NHVR Heavy Vehicle Mass and Dimension Limits Fact Sheet (HVMDL) covers the prescribed dimensions for the width, height and length of heavy vehicles such as rigid trucks, semi trailers and dog trailers, as well as the correct length and articulation point for trailers, and rear overhang requirements, and the axle mass limit for Australian heavy vehicles.
The HVMDL Fact Sheet also outlines dimensions used in the heavy vehicle industry relating to specific trailer types including livestock carriers (for cattle, horses, pigs or sheep), refrigerated vans, and car carriers, and provides detailed comparison tables for axle mass limits.