Supply-chain efficiency remains a major policy theme across the freight sector, and industry discussions continue to focus on better coordination between transport operators, sites and customers. One practical area that deserves more attention is delivery slot design. Appointment systems can improve throughput, reduce congestion and support better utilisation. But if those systems are rigid, unrealistic or disconnected from transport realities, they can generate HVNL risk across the chain.
The issue is not the existence of booking windows. The issue is whether delivery slot rules create pressure that a reasonable party should foresee. A narrow appointment window, combined with penalties for lateness, mandatory waiting, restricted unloading periods or inflexible rescheduling, can influence scheduling decisions in ways that affect speed compliance, fatigue management and lawful route use. Under the HVNL, commercial settings are relevant where they encourage or reward unsafe outcomes.
This matters particularly in multi-drop, metropolitan and mixed-fleet operations. A single late-running warehouse handover, traffic delay or customer-side queue can ripple through the rest of the day. If the booking model assumes perfect conditions, schedulers and drivers may be left carrying the risk. Businesses should not wait for an incident to ask whether their appointment settings are effectively pressuring non-compliance.
From a CoR perspective, operators should assess both the slots they impose on others and the slots they accept from customers. Questions worth testing include: how much tolerance is built into appointments; who can approve re-sequencing; whether estimated travel times account for legal driving limits and actual road conditions; and whether detention, curfews or site restrictions have been built into planning assumptions.
This is also a subcontractor issue. Prime contractors often rely on subcontracted capacity to meet narrow booking requirements. If subcontractors are engaged into unrealistic appointment frameworks without transparent risk controls, the principal’s exposure does not disappear. There should be a clear process for identifying impossible schedules, escalating them early and renegotiating customer expectations where needed.
Good practice includes realistic transit modelling, buffer time around constrained sites, customer agreements that allow lawful rescheduling, and management reporting on missed slots, queue-related delays and repeat problem locations. Those data points can reveal whether a booking system is supporting compliance or quietly undermining it.
The broader policy conversation about freight productivity should not be separated from safety law. Efficient freight movement is not achieved by transferring timing risk to whichever party is closest to the road. Under the HVNL, every party must take reasonably practicable steps to avoid creating that pressure.
If your business needs a clearer view of where customer commitments and scheduling rules may be introducing CoR risk, an independent audit can help. COR’s independent CoR audits test how commercial practices, planning controls and on-the-ground operations fit together under the HVNL.