PBS trucks explained: What it is and how it affects your business

With freight volumes tipped to rise by 30 to 50 per cent over the next 20 years, improving productivity and safety in road transport has never been more critical. Necessity breeds innovation, which is why we’re now seeing increasingly creative axle and trailer combinations on Australian roads.

We spoke to Les Bruzsa, Chief Engineer at the National Heavy Vehicle Regulator (NHVR), to get a clearer picture of Performance Based Standards (PBS) for heavy vehicles in Australia.

Traditionally, heavy vehicle regulations have been prescriptive, setting hard limits on width, height, length, axle loads and gross combination mass.

“We created a set of safety and infrastructure standards, and we assess vehicles against those standards. This covers things like how stable the vehicle is, how it negotiates a turn, and how it handles a roundabout,” Bruzsa explains.

“So your vehicle can be longer, wider, or higher, even look completely different—provided it meets those safety and infrastructure standards.

“In a nutshell, show us that your truck can brake safely, turn corners without hitting things, and won’t damage the roads beyond allowable limits, and we’ll approve it.

“It’s about performance, not appearance.”

The process starts with engineers running thousands of virtual tests including emergency braking, sharp turns and varied road conditions using computer modelling.

This is followed by real-world testing at proving grounds, where sensors measure how the truck performs. Infrastructure analysis then checks whether bridges and road surfaces can handle the proposed loads.

Finally, there’s route approval, which determines which roads the truck can safely use.

Here are several key PBS related statistics, according to Bruzsa.

For operators, PBS means trucks can be purpose-built for specific jobs, whether that’s hauling mining gear, livestock, or containers.

For the public, it means safer roads, since every PBS truck must outperform minimum safety standards. For the economy, it means lower freight costs, which flow through to the prices of everyday goods.

PBS vehicles deliver 30 to 35 per cent better productivity than standard trucks.

Bruzsa offers an example:

"On a 26m combination, you cannot carry two 40-foot containers. So we introduced these 30m long PBS A-double combinations that allow two 40-foot containers to be transported by one truck.

“There is a 4m increase in overall length but that increased productivity by 100 per cent. Obviously that vehicle is designed to meet stability standards."

Tippers also show productivity gains of 30 to 50 per cent, with PBS A-doubles carrying 55-tonne payloads versus 42 tonnes on standard B-doubles.

The statistics (according to NHVR) speak volumes:

Bigger loads per trip means fewer trips required which translates to lower emissions and less wear on the roads.

“Compare a 26m B-double with a 30m PBS A-double on a 1000-tonne, 1000km haul,” Bruzsa said.

“The B-double carries about 42 tonnes, the PBS A-double about 55. That translates to a 21 per cent reduction in kilometres travelled, a 70 per cent reduction in fatal crash probability, and a 10 to 12 per cent cut in fuel use and CO2 emissions.”

In addition, there’s also a 30 per cent reduction in pavement impact, with more than 8000 vehicles displaced from the road since 2008 thanks to more efficient PBS combinations.

The PBS scheme has grown from niche to mainstream, now a cornerstone of Australia’s heavy vehicle fleet. It helps tackle pressing challenges like driver shortages and rising freight demand.

The bottom line: PBS allows innovation to thrive safely by focusing on results instead of rigid rules. That’s why Australia today operates some of the world’s most advanced and productive heavy vehicles.