The short version
- Mass, dimension and loading breaches have 3 risk categories: minor, substantial and severe.
- The critical risk category applies to fatigue breaches only.
- Mass: a breach is severe from 120% of the maximum mass.
- Dimension: only categorised when the load causes the breach.
- Loading: depends on whether the load moved and the safety risk.
- Severe breaches have no on-the-spot fine. The matter goes to court.
In this article
- The Short Answer: Three Risk Categories
- What Do Mass, Dimension and Loading Mean?
- Mass Breach Risk Categories
- Mass Breach Fines and Penalties
- Vehicles Under a Notice, Permit or Mass Exception
- Dimension Breach Risk Categories
- Night-Time and Bad Weather Make It Worse
- Dimension Breach Fines and Penalties
- Loading Breach Risk Categories
- Loading Breach Fines and Penalties
- What Happens at the Roadside?
- It’s Not Just the Driver: Chain of Responsibility
- Why Early Advice Matters
- Frequently Asked Questions
- Speak With Eric Before You Respond
If your truck is pulled over for being overweight, oversize or carrying an unsafe load, the first thing an officer will do is work out how serious the breach is. That decision affects the fine, whether you can keep driving and whether the matter ends up in court.
This guide explains the mass, dimension and loading breach categories in plain English, with the current fines under the Heavy Vehicle National Law (HVNL).
The Short Answer: Three Risk Categories
Under the HVNL, mass, dimension and loading breaches are sorted into three risk categories:
- Minor risk
- Substantial risk
- Severe risk
There is also a fourth category, critical risk, but it only applies to fatigue breaches. It does not apply to mass, dimension or loading.
The category depends on how far over the limit the vehicle is, or how dangerous the load is. The higher the risk to public safety and road infrastructure, the higher the category and the bigger the penalty.
What Do Mass, Dimension and Loading Mean?
Mass is how heavy the vehicle and its load are, including the weight on each axle.
Dimension is the size of the vehicle and load, such as length, width, height and how far a load sticks out.
Loading is how well the load is secured, so it does not fall off or shift while the vehicle is moving.
Each of these has its own rules for working out which risk category a breach falls into.
Mass Breach Risk Categories
Mass breaches are categorised by how far the vehicle is over its maximum mass limit. The more overweight the vehicle, the greater the risk to other road users and the more damage it does to roads and bridges. For more on overloading, see our guide to overloading fines in NSW.
Minor risk
Anything below the substantial risk threshold.
Substantial risk
Starts at 105% of the maximum mass, or 0.5 tonnes over the maximum mass, whichever is higher.
Severe risk
Starts at 120% of the maximum mass.
For example, if an axle group has a maximum mass of 20 tonnes:
- Minor: up to 20.9 tonnes
- Substantial: 21 tonnes up to 23.9 tonnes
- Severe: 24 tonnes or more
Mass Breach Fines and Penalties
These are the maximum court penalties and infringement (on-the-spot) fines under the HVNL for 1 August 2026 to 30 June 2027.
Minor risk mass breach
Infringement fine: $563
Maximum court penalty: $5,630
Substantial risk mass breach
Infringement fine: $848
Maximum court penalty: $8,480
Severe risk mass breach
Infringement fine: none – the matter must go to court
Maximum court penalty: $14,120, plus up to $710 for every extra 1% over a 120% overload (capped at an extra $28,230)
This means a severe overload of around 160% or more can expose a driver or operator to a maximum penalty of more than $42,000 for a single breach.
Vehicles Under a Notice, Permit or Mass Exception
Many vehicles operate under a notice, a permit or a mass exception such as Higher Mass Limits (HML). Breaching the conditions can change which limits you are measured against.
If you break a condition of a mass exception like HML, the exception no longer applies. The vehicle is then assessed against the standard (lower) mass limits, which can push a breach into a higher risk category.
If you meet all the HML conditions but are still over an HML limit, the vehicle is assessed against the HML limits instead.
Read more about how Eric defends mass offences.
Received a notice for a mass, dimension or loading breach?
Get advice before you respond. How the breach was categorised and measured can change the outcome.
Dimension Breach Risk Categories
Dimension breaches are only categorised when the vehicle is carrying a load and the load causes the breach. If an empty (unladen) vehicle is over a dimension limit, it is treated as a separate dimension breach, not a minor, substantial or severe one.
The thresholds depend on which measurement is exceeded.
Overall length
Minor: up to 349mm over the limit
Substantial: 350mm to 599mm over
Severe: 600mm or more over
Overall width
Minor: up to 39mm over the limit
Substantial: 40mm to 79mm over
Severe: 80mm or more over
Overall height
Minor: up to 149mm over the limit
Substantial: 150mm to 299mm over
Severe: 300mm or more over
Loads projecting from the side
Minor: up to 39mm over the limit
Substantial: 40mm to 79mm over
Severe: 80mm or more over
Rear overhang
Minor: up to 349mm over the limit
Substantial: 350mm to 599mm over
Severe: 600mm or more over
A load just 8cm too wide is already a severe risk breach.
Notice how small the margins are for width and side projection compared with length and height.
Night-Time and Bad Weather Make It Worse
A dimension breach is moved up a category if it happens at night or in hazardous weather that reduces visibility.
- A minor breach becomes a substantial breach.
- A substantial breach becomes a severe breach.
A substantial breach also becomes severe if the load projects in a way that is dangerous.
Dimension Breach Fines and Penalties
Current HVNL penalties for 1 August 2026 to 30 June 2027:
Unladen vehicle over a dimension limit
Infringement fine: $563
Maximum court penalty: $5,630
Minor risk dimension breach
Infringement fine: $563
Maximum court penalty: $5,630
Substantial risk dimension breach
Infringement fine: $848
Maximum court penalty: $8,480
Severe risk dimension breach
Infringement fine: none – the matter must go to court
Maximum court penalty: $14,120
Read more about how Eric defends dimension offences.
Loading Breach Risk Categories
Loading breaches work differently. There is no measurement to compare against. Instead, the category depends on two questions:
- Has the load actually fallen off or shifted, or is it only likely to?
- Does the loss or shifting of the load involve an appreciable safety risk?
Load has not moved, but is likely to – no appreciable safety risk
Category: Minor risk
Load has not moved, but is likely to – appreciable safety risk
Category: Substantial risk
Load has fallen off or shifted – no appreciable safety risk
Category: Substantial risk
Load has fallen off or shifted – appreciable safety risk
Category: Severe risk
In simple terms, a poorly restrained load that has not yet moved can still be a substantial breach if it is dangerous. Once a load has actually shifted or fallen and creates a real safety risk, it is a severe breach.
The NHVR’s Load Restraint Guide sets out how loads should be restrained, with diagrams and worked examples.
Loading Breach Fines and Penalties
Current HVNL penalties for 1 August 2026 to 30 June 2027:
Minor risk loading breach
Infringement fine: $423
Maximum court penalty: $4,230
Substantial risk loading breach
Infringement fine: $706
Maximum court penalty: $7,060
Severe risk loading breach
Infringement fine: none – the matter must go to court
Maximum court penalty: $14,120
Read more about how Eric defends load offences.
What Happens at the Roadside?
The risk category also decides what an authorised officer can direct you to do with the vehicle. This can cost a transport business far more than the fine itself, through delays, unloading and missed deliveries.
Minor risk breach
You may be directed to:
- fix the breach on the spot
- move the vehicle to a place within 30km and not move it until the breach is fixed, or
- continue along the forward part of the journey.
Substantial risk breach
You will be given a written notice directing you to either:
- not move the vehicle until the breach is fixed, or
- move it to a stated reasonable place, such as a depot, weighbridge, rest area or unloading point, and not move it until the breach is fixed.
Severe risk breach
You will be given a written notice directing you not to move the vehicle until the breach is fixed. If the vehicle poses a risk where it is, you may be directed to move it to the nearest safe location and keep it there until the breach is fixed.
Ignoring a direction is a separate offence.
The maximum court penalty for not complying with a direction is $14,120.
It’s Not Just the Driver: Chain of Responsibility
Mass, dimension and loading breaches often start well before the truck leaves the yard. Under the chain of responsibility laws in the HVNL, everyone in the supply chain has a primary duty to ensure the safety of their transport activities, so far as reasonably practicable.
That can include operators, schedulers, consignors, packers, loaders and loading managers. Company executives also have a duty to exercise due diligence.
The maximum penalties for breaching the primary duty are much higher than the roadside fines (1 August 2026 to 30 June 2027):
Category 1 offence
Individual: $436,850, 5 years imprisonment, or both
Corporation: $4,230,550
Category 2 offence
Individual: $212,090
Corporation: $2,120,880
Category 3 offence
Individual: $70,580
Corporation: $705,820
A pattern of overloading or poorly restrained loads can lead the NHVR to look beyond the driver and investigate the business’s systems.
Why Early Advice Matters
Many NHVR matters are won or lost early, before they ever reach court. How the breach was categorised, how the measurements were taken and what you say in response can all affect the outcome.
It is also easy to give the NHVR more information than a notice legally requires. That information can later be used as evidence against you or your business.
Frequently Asked Questions
How many risk categories are there for mass, dimension and loading breaches?
Three: minor, substantial and severe.
Is there a critical risk category for overloading?
No. The critical risk category only applies to fatigue breaches.
What percentage overload is a severe breach?
A mass breach is severe when the vehicle is at 120% or more of its maximum mass.
Can I get an on-the-spot fine for a severe breach?
No. Severe risk mass, dimension and loading breaches have no infringement option. They must be dealt with by a court.
Does driving at night make an oversize breach worse?
Yes. Dimension breaches at night or in poor visibility move up one risk category.
Speak With Eric Before You Respond
Eric Navea is a former Senior Prosecutor at the NHVR. He understands how investigators assess mass, dimension and loading breaches, when matters escalate and how prosecution cases are prepared.
As a heavy vehicle lawyer, Eric focuses on heavy vehicle and NHVR defence, acting for transport businesses and drivers across NSW. He will identify the immediate issues, important deadlines and the information needed to properly assess your position.
Received an infringement notice, court attendance notice or NHVR notice for a mass, dimension or loading breach? Speak with Eric before you respond.
Speak With Eric Before You RespondDisclaimer
This article is general information only and is not legal advice. Penalty amounts are from the NHVR schedule for 1 August 2026 to 30 June 2027 and are indexed each year. Case outcomes depend on the individual facts and circumstances of each matter.
