Key takeaways
| Factor | What it means for you |
|---|---|
| 2026 notice changes | NHVR's 2026 notices expanded access for tri-axle-group prime movers, mainly in South Australia. |
| State matters | Tri-axle drive access is permitted in SA under the notice; other states still need a permit or a retractable axle. |
| Euro VI concession | Eligible Euro VI road train prime movers can access a steer-axle mass concession. |
| Config follows access | Spec the axle configuration around the combinations and routes you actually run. |
| Check before you buy | Confirm the access rules for your states before committing to a configuration. |
Why access rules now shape the axle decision
When you spec a prime mover, the axle configuration is not just about traction and weight. It also decides what combinations and networks you can legally run, and in 2026 those rules changed.
In April 2026 the NHVR updated several authorisation notices to expand access, with much of the change focused on South Australia. The headline for buyers is that tri-axle-group prime movers gained access in some combinations, and eligible Euro VI prime movers gained a steer-axle mass concession. That makes the configuration choice a productivity and access decision, not just a mechanical one. For pricing by configuration, see our prime mover price and buying guide.
How the change affects different buyers
| If you run | What the 2026 changes mean |
|---|---|
| SA freight routes | A tri-axle-group prime mover may gain notice access it did not have before. |
| Other states | Tri-drive access is more limited; you may still need a permit or retractable axle. |
| Euro VI road trains | An eligible prime mover can access a steer-axle mass concession. |
| Single-trailer work | Standard configurations are largely unaffected; spec to the task as usual. |
The change matters most if you run productivity combinations in South Australia: a configuration that was permit-only may now have notice access, which can cut red tape and lift freight per trip.
It matters less if you run single trailers or stay outside SA: the core spec decision still comes down to traction, mass and the combinations you actually run.
Australian compliance points
- The 2026 NHVR notices expanded access for tri-axle-group prime movers, with much of the change applying in South Australia.
- In ACT, NSW, QLD, TAS and VIC, a tri-drive prime mover in a B-double generally still needs a retractable axle or a permit.
- Eligible Euro VI road train prime movers can access a steer-axle mass concession under the updated notices.
- Access depends on the specific notice, network and route, so check the current operator guide for your states.
- A heavy combination or multi-combination licence applies depending on the configuration you run.
What to check and ask before you get quotes
| What to check | What to ask the supplier |
|---|---|
| Axle configuration | Is this 4x2, 6x4 or 8x4, and does it suit the combinations I run? |
| Combination access | What notice access does this configuration have in the states I operate? |
| Tri-axle setup | If tri-drive, does it have a retractable axle for states that require it? |
| Emissions level | Is it Euro VI, and does that open any mass concession for my work? |
| GCM rating | What is the gross combination mass rating for the combinations I plan? |
| Registration code | Is it registered for the multi-combination work I intend? |
| Suspension | Does it have road-friendly suspension where mass concessions need it? |
| Independent check | Can I get my own inspection before I commit? |
Once you know the configuration suits your combinations and routes, get quotes for prime mover trucks from a few suppliers so you can compare like for like.
Frequently asked questions
What changed for prime movers in the 2026 NHVR notices?
The April 2026 notices expanded access for prime movers with tri-axle groups, with much of the change focused on South Australia, and extended a steer-axle mass concession to eligible Euro VI road train prime movers. The aim was to let operators move more freight per trip and reduce permits.
Does the tri-axle access apply everywhere?
No. Under these notices the tri-axle-group access is largely South Australia-specific. In ACT, NSW, QLD, TAS and VIC, a tri-drive prime mover in a B-double generally still needs a retractable axle or a permit, so check your states before you spec.
Should I buy a tri-axle prime mover because of the change?
Only if it suits the work you do. The change helps operators running productivity combinations in South Australia most. For single-trailer or interstate work outside SA, the core decision still comes down to traction, mass and your combinations. If you haul plant on a low-loader, also match the prime mover to the trailer, as covered in our low-loader trailer buying guide.
What is the Euro VI mass concession about?
Euro VI trucks are heavier due to emissions and safety technology, so the updated notices let eligible Euro VI road train prime movers access a steer-axle mass concession. It helps offset that extra weight, within the notice conditions.
How do I confirm what access my configuration has?
Access depends on the specific notice, network and route, so check the current NHVR operator guide for the states you run. The supplier can confirm the configuration and registration, but the access rules are set by the notices.
What matters most
- The 2026 notices expanded tri-axle-group access, mainly in South Australia.
- Other states often still need a permit or retractable axle for tri-drive.
- Eligible Euro VI road train prime movers gained a steer-axle mass concession.
- Spec the configuration around the combinations and routes you run.
- Always confirm the current access rules for your states before buying.
Get and compare prime mover truck quotes now from verified Australian suppliers, with the configuration and access confirmed up front.
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