Mass Limit Offences: What Heavy Vehicle Operators Need to Know

In this article

1. What Are Mass Limits?
2. Big Change From 1 August 2026: Higher General Mass Limits
3. Higher Mass Limits and PBS Still Need Accreditation
4. Road Manager Restrictions Still Apply
5. Update Your Load Plans
6. How Overloading Breaches Are Categorised
7. How Is the Truck Weighed?
8. Fines and Penalties for Mass Breaches
9. What Happens at the Roadside?
10. Why Operators Are in the Firing Line
11. Practical Steps to Reduce Your Risk
12. Frequently Asked Questions
13. Speak With Eric Before You Respond

Overloading is one of the most common heavy vehicle offences. For operators, it is rarely just a roadside fine. A mass breach can lead to delays, unloading costs, court proceedings and an investigation into how your business plans and loads its work.

This guide explains mass limit offences: the current mass limits, the important changes that started on 1 August 2026, how breaches are categorised and what penalties apply.

What Are Mass Limits?

Mass limits set the maximum weight a heavy vehicle can carry. They apply to:

• each axle or axle group (for example, the steer axle, tandem drive or tri-axle trailer group)
• the total (gross) mass of the vehicle or combination.

A vehicle can be under its total limit but still be overloaded on one axle group. Uneven loading is a common cause of mass breaches.

The loaded vehicle must also never exceed the manufacturer’s ratings, such as the Gross Vehicle Mass (GVM), Gross Combination Mass (GCM) or the rating on a tyre, axle or coupling.

Big Change From 1 August 2026: Higher General Mass Limits

From 1 August 2026, General Mass Limits (GML) increased to match the old Concessional Mass Limits (CML). Operators no longer need Mass Management accreditation to use these higher limits.

Key axle limits

Key gross mass limits

Other changes

• Overall mass increases are capped at 1 tonne for vehicles up to 55 tonnes and 2 tonnes for combinations over 55 tonnes.
• The 5% gross mass restriction and the one-tonne tri-axle mass transfer allowance were removed.
• Bus axle group limits did not increase.
• Euro VI prime movers on road trains can now carry up to 7.0 tonnes on the steer axle (with eligible tyres).

Higher Mass Limits and PBS Still Need Accreditation

The new general limits do not change Higher Mass Limits (HML) or Performance Based Standards (PBS) vehicles. Mass accreditation is still required for HML and PBS, and PBS vehicles must keep following the mass limits in their vehicle approval.

Road Manager Restrictions Still Apply

The changes do not automatically open up new roads. Local councils and other road managers keep their existing powers to restrict heavy vehicle access and set conditions. Always check the route.

Update Your Load Plans

The NHVR recommends operators update load plans, mass calculations and compliance records before operating under the new limits.

How Overloading Breaches Are Categorised

Mass breaches under the Heavy Vehicle National Law (HVNL) fall into three risk categories:

Example using the new 21-tonne tri-axle limit:

• Minor: up to 22.0 tonnes
• Substantial: 22.1 tonnes up to 25.1 tonnes
• Severe: 25.2 tonnes or more

For how dimension and loading breaches are categorised, see our guide to mass, dimension and loading breach categories.

How Is the Truck Weighed?

When an authorised officer weighs a vehicle, a measurement adjustment is deducted from the reading to allow for equipment and site variations. The adjusted figure, called the assessed mass, is used to decide whether there is a breach and which category it falls into.

The adjustment depends on the axle group and the type of site. For example, for a tri-axle group:

The adjustment only applies where the vehicle is physically weighed. It does not apply where the mass is calculated by other means, such as from weighbridge dockets or load records.

Fines and Penalties for Mass Breaches

These are the HVNL penalties from 1 August 2026 to 30 June 2027.

That means a single severe overload can expose a driver or operator to a maximum penalty of more than $42,000. Multiple axle groups or multiple trips can mean multiple charges. For more on fines and who is responsible, see our guide to overloading fines in NSW.

What Happens at the Roadside?

Depending on the category, an officer can direct you to fix the overload on the spot, move the vehicle to a nearby place (such as a depot or weighbridge) or not move it at all until the load is reduced.

Not complying with a direction is a separate offence with a maximum court penalty of $14,120.

For operators, the real cost is often the downtime, the cost of unloading or sending a second truck, and the missed delivery.

Why Operators Are in the Firing Line

Mass breaches usually start before the truck leaves the yard. Under the chain of responsibility laws, everyone with control or influence over the transport task has a primary duty to ensure its safety, so far as reasonably practicable.

For mass, that can include:

• the operator and scheduler
• the consignor and consignee
• loading managers and loaders
• packers and those who prepare container weight declarations.

Company executives also have a duty to exercise due diligence.

The maximum penalties for breaching the primary duty (1 August 2026 to 30 June 2027) are:

False or misleading transport documents or container weight declarations carry a maximum penalty of $28,230.

Practical Steps to Reduce Your Risk

• Know the mass limits for each vehicle and combination you run, and update your records for the 1 August 2026 changes.
• Weigh loads where possible, rather than relying on estimates.
• Spread the load correctly so no single axle group is overloaded.
• Check manufacturer ratings, permits and route restrictions.
• Keep records of how you manage mass. Good systems are your best evidence if something goes wrong.

Frequently Asked Questions

Speak With Eric Before You Respond

Many NHVR matters are won or lost early, through the first response, the first request for information and the first strategic decision. It is also easy to give the NHVR more information than a notice legally requires, which can later be used as evidence.

Eric Navea is a former Senior Prosecutor at the NHVR. He understands what investigators look for in mass matters, when they escalate to chain of responsibility investigations and how prosecution cases are prepared.

As a transport business lawyer, Eric focuses on heavy vehicle and NHVR defence and acts for transport businesses across NSW, from owner-operators to large fleets. See how he defends mass offences. He will identify the immediate issues, important deadlines and the information needed to properly assess your position.

Has your business received an infringement notice, court attendance notice or NHVR notice for a mass breach? Speak with Eric before you respond.

Speak With Eric Before You Respond