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

A heavy vehicle must have a ground clearance of at least—

at a point within 1m of an axle—100mm; and

at the midpoint between adjacent axles—one-thirtieth of the distance between the centre-line of each axle; and

at any other point—the distance that allows the vehicle to pass over a peak in the road if the gradient on either side of the peak is 1:15.

Example—

Measuring ground clearance for paragraph (c)

In this section—

ground clearance, of a vehicle, means the minimum distance between the ground and the vehicle’s underside, other than its tyres, wheels, wheel hubs, brake backing plates, flexible mudguards and mudflaps.