Supply-chain efficiency debates often focus on infrastructure, productivity and cost, but detention time is becoming harder to treat as a simple commercial inconvenience. As policy discussions continue across the freight sector, one issue keeps returning: time lost at depots, distribution centres and customer sites can quickly turn into a safety problem under the HVNL.
For heavy-vehicle operators, the risk is familiar. A vehicle arrives on time, then waits well beyond the planned slot. The rest of the day does not move with it. Delivery windows tighten, return legs are compressed, driver frustration rises, and decisions that looked manageable in the morning become unsafe by the afternoon. The pressure can show up in fatigue exposure, hurried loading, skipped checks, or informal instructions to “make up time”.
That matters because Chain of Responsibility duties are not confined to the transport operator. Parties in the supply chain who influence timing, site access, queue handling and turnaround expectations can affect whether transport activities are safe. If a site routinely creates long delays while still expecting strict departure or arrival targets, that pattern can become relevant to whether risks were being managed so far as was reasonably practicable.
ALC policy discussions about freight productivity and supply-chain performance give operators a useful lens here. Efficiency is not separate from safety when delay patterns are predictable. A mature business should be treating detention time as a measurable safety input, not just a service KPI. If your waiting times regularly push trips into higher-risk periods, your controls need review.
The first step is evidence. Track where delays occur, how long they last, and what operational consequences follow. Do delayed vehicles require roster changes, break adjustments, late loading, or re-sequencing? Do drivers report pressure after certain sites? Are loaders and schedulers forced to improvise because the original plan has collapsed? Without this data, detention time stays anecdotal and difficult to control.
The second step is escalation. High-delay sites should trigger management attention, not just driver complaints. Operators should review whether service commitments remain safe, whether loading windows need redesign, and whether customers or upstream parties need formal engagement. In some cases, the safest solution is to refuse planning assumptions that depend on perfect turnaround performance from a site that never delivers it.
Under the HVNL, serious outcomes can bring scrutiny to everyone who shaped the task. Depending on the conduct and the risk created, offences may sit within the categories of minor, substantial, severe or critical risk, and broader primary duty obligations may also come into play. Maximum penalties are substantial, particularly where exposure to harm is significant.
The key message is simple: detention time is operational data, but it is also compliance data. If your business still treats chronic site delay as someone else’s problem, your CoR controls may already be behind the industry.
If you want independent insight into how customer delays, scheduling assumptions and site practices are affecting your CoR exposure, COR Safety Management Systems can help with an independent CoR audit.