Mass offences for truck drivers in Australia:
What you need to know
Mass breaches are among the most common heavy vehicle offences in Australia, and the rules changed significantly on 1 August 2026 when the amended Heavy Vehicle National Law took effect. The headline change is good news for most operators: General Mass Limits have been raised to the levels previously only available under Concessional Mass Limits, and the separate CML category has been abolished. Most combinations gained up to a tonne, and combinations over 55 tonnes up to two tonnes, with no accreditation required.
That does not make mass offences any less serious. The limits are still complex, they still vary with vehicle configuration and load placement, and exceeding them still brings heavy fines, multiplied five times for a corporation. At Big Rig Law, we specialise in helping truck drivers and companies defend against mass offences. Whether you have received a court attendance notice or a fine in the mail, we are here to help you navigate the legal system and minimise the impact on your livelihood.
What Are Mass Offences?
A mass offence occurs when a truck is found to be carrying more weight than legally allowed, or is under its allowable gross mass but over on one or more axles or axle groups. Even load distribution plays a role, meaning a perfectly legal load on one truck might be illegal on another simply due to weight placement.
The key limits changed on 1 August 2026. Under the new General Mass Limits:
- Tandem axle groups: 17.0 tonnes, up from 16.5
- Tri-axle groups (other than pig trailers): 21.0 tonnes, up from 20.0
- Quad-axle groups with dual tyres or single tyres 375mm and wider: 21.0 tonnes, up from 20.0
- Quad-axle groups with single tyres narrower than 375mm: 15.5 tonnes, up from 15.0
- Single steer axles: unchanged at 6.0 tonnes, with Euro VI steer axle concessions of up to 7.0 tonnes now extended to road trains
If you were accredited under NHVAS Mass, that scheme is transitioning to Alternative Compliance Accreditation for Mass under the new Heavy Vehicle Accreditation scheme. One trap in the transition: an offence alleged to have occurred before 1 August 2026 is assessed against the old limits, not the new ones. The date of the alleged offence matters, and we check it.
Why Do Mass Offences Happen?
Most truck drivers make every effort to comply with the law. The recent changes add their own confusion while old weight charts and stickers are still floating around depots. Mass offences often happen due to a number of factors:
- Inaccurate Weighing: Weighing equipment at loading docks may not always be accurate, leading to miscalculations.
- Load Shifts: During long trips, loads can shift, causing the truck to become overweight on certain axles.
- Pressure from Deadlines: Tight schedules can lead to rushed loadings where careful weighing and distribution are overlooked.
- Confusing Regulations: Different states and territories may have their own rules about mass limits, making compliance difficult when crossing borders.
At Big Rig Law, we understand these challenges and work with drivers to help defend against unfair fines and penalties.
What to Do If You’re Pulled Over for a Mass Offence
Being pulled over and found overweight can be stressful, especially if you’re unsure of the next steps. However, there are a few key protocols you can follow to keep yourself out of further trouble:
1. Stay Calm and Cooperative
When you’re pulled over, remain calm and polite with the enforcement officer. Arguing or becoming defensive can escalate the situation unnecessarily. Always provide your work diary and documents when requested.
2. Verify the Measurement
If you are accused of exceeding the mass limit, ask the officer how the weight was measured. Was the truck weighed at a roadside weighbridge or using portable scales? If the scales used seem inaccurate, politely request for the vehicle to be re-weighed. Some portable scales may not always provide the most reliable results, especially on uneven surfaces. It is also worth asking which mass limits are being applied, since the limits changed on 1 August 2026.
3. Document Everything
Take notes and photos of the weighing process and the vehicle’s positioning. This evidence could be critical later on if you need to dispute anything later. Note down the officer’s name, the location, and any other relevant details. This helps build a stronger case if the fine is challenged in court.
4. Your Right to Remain Silent - Don’t Admit Fault
Roadside officers must caution you before interview and must gain your consent to record it on body worn camera. Remember, you have a right to remain silent. You can be cooperative without agreeing that you’re in the wrong. Simply note that you’re understand what has been advised and will be seeking legal advice.
5. Contact Big Rig Law
After the incident, contact Big Rig Law as soon as possible. We’re available 24/7 to provide immediate legal assistance and can help you understand your options. Whether it’s disputing the accuracy of the weighing or negotiating to reduce penalties, we’re here to guide you through the process.
Penalties for Mass Offences
The penalties for mass offences vary depending on the severity of the breach. Offences are typically categorised into minor, substantial and severe breaches, with fines increasing based on how far the vehicle exceeds its weight limits. A number of penalty amounts were adjusted from 1 August 2026 as part of a broader rebalancing of HVNL penalties. Penalties are multiplied by 5 for a corporation. Below is a breakdown:
- Minor Breaches: These are typically small overloading cases where the truck slightly exceeds the allowable mass. Fines for minor breaches can start at a few hundred dollars.
- Substantial Breaches: In these cases, the truck is significantly over the legal limit, and fines can reach into the thousands.
- Severe Breaches: Severe overloading is considered a serious offence and will likely lead to court action with fines in the tens of thousands of dollars.
Can You Dispute a Mass Offence?
Yes, mass offences can be disputed if you believe there has been an error in measurement. Even if you accept the vehicle was over mass, you can choose to go to court to explain what happened and seek leniency on the penalty. Companies can dispute a permit offence if they can prove they were not the party responsible for the heavy vehicle or that the driver was operating outside the scope of his or her duties at the time of the offence. With the new limits in force, we also check that the correct limits for the correct date were applied. Big Rig Law has in-depth knowledge of the issues around mass breaches. We will review the details of your case, look for any errors in the enforcement process, and work to get your fine reduced or dismissed.
How Big Rig Law Can Help
At Big Rig Law, we understand the pressure truck drivers are under. A mass offence can put your job, your business, and your livelihood at risk. That’s why we’re here to provide immediate legal assistance. Here’s how we can help:
- Legal Representation: If you’re facing court over a mass offence, we’ll be there to represent you and fight for a fair outcome.
- Fine Reductions: In many cases, we can help reduce the severity of the fine or even have it dismissed entirely, especially if there’s a valid defence.
- Ongoing Support: We’re not just here for one-off cases. Big Rig Law offers ongoing legal support to truck drivers and transport companies, connecting you with compliance experts who can help you stay compliant and avoid future penalties.
Mass offences can be a major headache for truck drivers, but they don’t have to derail your career. By understanding the laws, following the right steps when pulled over, and having the right legal team on your side, you can minimise the impact of these charges. At Big Rig Law, we’re dedicated to being there when you need us most and helping you stay on the road.
Don’t face charges for a mass offence alone. Call Big Rig Law today and get the expert legal support you deserve.