The night before a move, a pilot gets a text with a meeting point and a start time. The permit is still sitting in the haulier’s inbox. At 4.30 the next morning, at the truck, someone finds out the permit has a curfew through the next town and needs a second pilot on one section.
This article explains what an oversize overmass (OSOM) permit is, where it comes from in each state, why every pilot needs a copy, and what to check on it before the move. It draws on National Heavy Vehicle Regulator (NHVR) guidance and state road authority pages. It is a working summary, not legal advice.
What counts as an OSOM vehicle
The Heavy Vehicle National Law calls these Class 1 load-carrying vehicles: a vehicle that, with its load, does not meet a prescribed mass or dimension requirement, and is carrying, or built to carry, a large indivisible item. A large indivisible item is one that cannot be divided without extreme effort, expense or risk of damage, and cannot be carried on any heavy vehicle without breaking a mass or dimension limit. The NHVR’s examples include excavators and other construction or mining machinery, wind turbine blades and tower sections, bridge beams, large tanks and pressure vessels, modular buildings and harvesters.
Notice or permit?
Not every oversize move needs a permit. If a gazette notice covers the vehicle and route, the move runs under the notice. The national Class 1 load-carrying vehicle dimension exemption notice for 2026 covers vehicles up to 5.5 metres wide, 35 metres long and 5 metres high, depending on the state, and the matching mass notice covers up to 115 tonnes, again depending on the state. Both apply in the Australian Capital Territory, New South Wales, Queensland, South Australia and Victoria.
When no notice covers the move, the operator applies for an OSOM permit. Notices still carry conditions, including pilot conditions, so the same checks apply.
Where OSOM permits come from
- Queensland, New South Wales, Victoria, South Australia, Tasmania and the Australian Capital Territory. Permit applications go through NHVR Go, the regulator’s online system.
- Western Australia. Apply to Main Roads Western Australia. Main Roads refers to single trip permits and its own standard operating conditions for OSOM vehicles.
- Northern Territory. Apply to the Northern Territory Government. The Territory introduced OSOM notices from 3 April 2025, which let eligible vehicles travel at night and in peak times without a three-year permit.
Who holds the permit, and why pilots need it
The NHVR issues permits to operators, not to pilot or escort drivers. Its guidance says a pilot cannot meet their obligations unless the operator tells them the permit conditions, and the best way is to give each pilot a full copy of the permit. If the move relies on a gazette notice, the operator should say which notice.
Under the national law, the pilot must comply with the conditions about the pilot vehicle, and the operator must make sure the pilot does. A pilot must not accompany the load on an unapproved route, outside permitted hours, or with fewer pilots or escorts than required. The NHVR says an operator who fails to pass the information on risks an offence, even if the pilot never asked for it.
What to check on the permit before the move
- Validity. The permit number, the dates it covers, and that it is the current version.
- Vehicle and load. The combination, the load, and the dimensions and mass approved. Measure before you go if the load looks different from the paperwork.
- Route. The approved route, start to finish, including any sections with their own conditions.
- Travel times. Permitted hours, curfews, and public holiday and long weekend rules. New South Wales publishes statewide curfews and long weekend travel requirements.
- Pilot and escort conditions. How many pilots, at what level, where they sit, and on which sections. See pilot vehicle requirements by state.
- Police or escort. Whether police or an authorised escort is needed, and the lead time to book them.
- Other approvals. In New South Wales, a rail infrastructure manager’s written approval is needed for level crossings not shown as approved on the network map, and some high-risk moves need a transport management plan.
- Paperwork to carry. The NHVR says a copy of the permit must be carried at all times. In New South Wales, a move with a police escort also carries a measurement record signed by the operator, the person who measured and the driver.
The booking agent’s handover
A booking agent sits between the haulier, who holds the permit, and the pilots, who need it. A good handover gives every confirmed pilot the full permit, the route and meeting point, the start time, the truck driver’s contact and any special conditions, before they leave home. It also confirms each pilot holds the right accreditation for every state on the route, which is covered in pilot vehicle licence and accreditation in every state.
How OpsChase reads the permit
In OpsChase pilot vehicle software, you upload or forward the permit PDF you already receive. OpsChase pulls out the route, travel times, curfews, dimensions and pilot or escort conditions, and suggests how many pilots the move needs, at what level, and whether police or an escort is required. You check it and confirm before anything goes out. Each confirmed pilot gets the job pack on their phone with the full permit attached, and when a permit calls for police or an escort, the job carries a reminder of the notice period.
OpsChase is independent software. It is not affiliated with, endorsed by or connected to the NHVR, any state or territory road authority or any police service. Permits are still applied for and issued through the same channels as now, and operators remain responsible for every permit condition.
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