Plant that exceeds general mass or dimension limits needs an oversize/overmass (OSOM) permit. In NSW, Victoria, Queensland, South Australia, Tasmania and the ACT, permits are issued through the National Heavy Vehicle Regulator (NHVR). Western Australia (Main Roads WA) and the Northern Territory manage their own permits. The transport provider normally applies, but lead times can run from days to weeks.
Choosing the right float
Tilt trays and beavertails handle small plant and EWPs. Tag trailers and low loaders carry 8–30 t machines. Larger excavators, dozers and cranes' counterweights need multi-axle floats and sometimes pilot vehicles.
When a permit is needed
General access limits are roughly 2.5 m wide, 4.3 m high and set mass limits per axle group. Anything over requires notice or a permit, and may need pilots, escorts, curfews and specific routes.
Who issues permits
NHVR: NSW, VIC, QLD, SA, TAS and ACT (with road manager consent). Main Roads WA Heavy Vehicle Services in Western Australia. NT Department of Logistics and Infrastructure in the Northern Territory.
On-site logistics
Plan a firm, level unloading area clear of power lines, with room for ramps and spotters. Coordinate delivery windows with site hours and neighbours.
Common questions
Who applies for an oversize permit?
Usually the transport company moving the plant. Ask them to confirm permit timing in their quote.
Does WA use the NHVR?
No. Western Australia's oversize and overmass permits are issued by Main Roads WA.