Heavy Vehicle (Mass, Dimension and Loading) National Regulation (NSW)

The mass of a single vehicle or combination must not be more than the lower of the following masses—

the mass that is the lower or lowest of the following—

for a complying bus without a trailer—

if the bus has only 2 axles but is not an eligible 2-axle bus—16t; or

if the bus has a rear tandem axle group fitted with single tyres on 1 axle and dual tyres on the other axle but is not an eligible 3-axle bus—20t; or

if the bus has a rear tandem axle group fitted with dual tyres on all axles—22.5t;

for a complying bus with a trailer, the sum of—

the mass limits for the bus mentioned in subparagraph (i); and

the mass that is the sum of the mass limits applying to the trailer’s axle groups and single axles under Table 1 of Part 2;

for a bus that is an ultra-low floor bus with no axle groups and only 2 single axles but is not an eligible 2-axle bus—16t;

for an eligible 2-axle bus—18t;

for an eligible 3-axle bus—22t;

for a complying steer axle vehicle that is neither a B-double nor a road train—43t;

for a Euro VI vehicle (complying steer axle) that is not a B-double—43.5t;

for a Euro VI vehicle (single steer axle) that is not a B-double—43t;

for a Euro VI vehicle (twinsteer) that is a prime mover with a twinsteer axle group towing a tri-axle semitrailer—47t;

for a prime mover with a twinsteer axle group towing a tri-axle semitrailer—46.5t;

for a vehicle that is not mentioned in subparagraphs (i) to (v) and that is neither a B-double nor a road train—42.5t;

the mass that is the sum of the mass limits stated in Table 1 of Part 2 in relation to each of the axle groups and single axles of the single vehicle or combination.

A vehicle is not within the amount of the mass stated in subsection (1)(b) if any single axle or axle group fitted to the vehicle has a mass in excess of the mass limits applying to the single axle or axle group.

The purpose of subsection (2) is to ensure that a vehicle cannot be brought within the mass stated in subsection (1)(b) by off-setting an under limit mass on an axle group or single axle against an over limit mass on another axle group or single axle.

In a combination, the mass of a dog trailer or pig trailer must not be more than the mass of the towing vehicle.

In a combination, the mass on the axle group or single axle of a tag trailer must not be more than the sum of the mass on all of the axles of the towing vehicle.

In this section—

over limit mass means the amount by which the mass on an axle group or single axle of a vehicle is more than the mass stated in relation to the axle group or single axle in Table 1 of Part 2.

single vehicle means a heavy motor vehicle that is not towing another vehicle.

under limit mass means the amount by which the mass on an axle group or single axle of a vehicle is less than the mass stated for the axle group or single axle in Table 1 of Part 2.