Safety Matters # 9 Why HVNL Chain of Responsibility Matters for Frame and Truss Manufacturers

In the timber frame and truss sector, most businesses do not see themselves as part of the heavy vehicle industry. However, under the Heavy Vehicle National Law (HVNL), if you design, manufacture, pack, schedule, load, transport or receive frames and trusses, you are part of the heavy vehicle supply chain.

That makes you, the frame and truss manufacturer a Chain of Responsibility (CoR) party. This is not just a technical legal point. It is a shift in how safety responsibility is applied across the industry.

Regulators are no longer focused only on drivers and what happens on the road. The focus is now on who influenced the conditions that led to the risk. Courts are reinforcing this by making it clear that responsibility is based on what you do, not your job title.

If your decisions affect transport safety, you have a legal duty.

For frame and truss manufacturers, this is particularly important because of the nature of the work. Loads are often long, flexible and sometimes over-dimension. Deliveries are made into tight residential streets and busy building sites. Unloading frequently involves cranes and time pressure.
This combination creates a situation where small upstream decisions can quickly turn into serious risks. Poor packing, unrealistic delivery windows or inadequate site planning can leave a driver with no safe options. The result can be fatigue breaches, load movement or unsafe unloading.

This is exactly what CoR laws are designed to address. They push responsibility upstream so that risks are managed before the truck leaves the yard.

A common misconception in the industry is that transport compliance sits with the carrier. Many manufacturers outsource delivery and assume the transport provider is responsible. Under HVNL, that is not the case.
CoR duties cannot be contracted out. If your business influences how loads are packed, scheduled or delivered, you remain responsible.

This includes decisions such as how trusses are bundled and supported, whether loads are dimensionally compliant, how delivery times are set and what instructions are given to drivers and carriers.
Transport safety, in practical terms, starts in the factory.
Regulators are also placing increasing emphasis on systems and evidence. It is not enough to say that safety is taken seriously. Businesses are expected to demonstrate how they identify risks, implement controls and monitor outcomes.

This is typically done through a Safety Management System that reflects how the business actually operates day to day. Investigations now look closely at scheduling practices, load restraint processes, contractor management, site delivery conditions and management oversight.
Across the sector, the same issues continue to appear. Load restraint failures with long or flexible packs. Dimension and access risks on residential sites. Scheduling pressure leading to fatigue and speeding. Poor coordination at site causing delays and unsafe unloading. Limited visibility from management over how transport risks are being controlled.

These are not isolated operational issues. They are CoR risks.

For business owners and managers, the law introduces a clear obligation to exercise due diligence. This means actively checking that systems are in place and that they are working. It requires regular review of performance, investigation of incidents and follow-up on corrective actions.
If something goes wrong, the question will not be whether the business cared about safety. It will be what steps were taken to ensure it.

The key takeaway is that the HVNL Chain of Responsibility is not just a transport issue. It is a business-wide responsibility that affects how frames and trusses are designed, packed, scheduled and delivered.

Businesses that understand this and act on it are better positioned to reduce risk, improve delivery outcomes and demonstrate compliance in an environment where scrutiny is increasing.

Refer to our fact sheet below 

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