Goods-in booking slots: windows hauliers actually keep

Three lorries arrived within the same twenty minutes last Thursday. One was booked for 8 am, one for 10 am, and one had no booking at all. The warehouse had one bay free and two staff on that shift. The 8 am driver had come early because he had another drop forty minutes up the road and wanted to get ahead of the traffic. The 10 am driver had come late because his previous delivery had overrun. The third was a regular who knew someone on the gate.

By half eleven the dock was clear, but so was any illusion that the booking system was doing its job.

Why the windows keep slipping

Hauliers are not wilfully difficult. They are running on tight margins, juggling multiple drops, and responding to their own customers’ last-minute changes. Your delivery window is one constraint among many, and unless you have given them a reason to treat it seriously, it will always yield to something more pressing.

The most common failure is that the window exists only on paper. A time is agreed, it goes into the TMS, and nobody follows up when it is missed. There is no charge. There is no rebooking process. The lorry turns up and, because turning it away creates its own chaos, it gets squeegeed in somehow. The message the haulier receives is that the window is a preference, not a requirement.

The second failure is capacity mismatch. Many sites set windows based on what they want to receive rather than what the dock can actually process. Two bays, one forklift, and a team of three cannot handle six 44-tonne trailers before noon, regardless of how the spreadsheet looks. Booking systems built on wishful thinking fall apart the moment volume picks up.

What you need before you change anything

Before you redesign your booking system, spend two or three weeks recording what actually happens rather than what was planned. Note the booked time, the actual arrival time, and the time the bay was cleared. Do this for every vehicle, not just the ones that cause problems.

What you are looking for is the gap between booked and actual, and whether it is random or patterned. A pattern, say all of one carrier’s vehicles arriving late on Mondays, points to a fixable cause. Random spread suggests the windows themselves are unrealistic or the confirmation process is broken.

You also want to know your real throughput per bay per hour. Not the theoretical figure, but the actual one, including the time spent on paperwork, queries, and waiting for a forklift. Most sites find this number is lower than expected. That is fine. It is the number you need to build an honest schedule around.

Setting windows that reflect reality

A delivery window should describe how long a vehicle will occupy your bay, with a margin for the things that reliably go wrong, and a short gap between slots for the things that unpredictably go wrong.

Thirty-minute slots work for most light commercial vehicles. Full trailers with mixed pallets often need forty-five minutes to an hour, and that is before you account for any discrepancy check or returns process. Build the gap in at the scheduling stage, not as an afterthought when the queue backs up.

Send the confirmed slot in writing, including the gate code or access procedure, and ask the transport office to confirm receipt. That single step removes a large proportion of missed slots that get logged as no-shows.

Making the window mean something

This is mostly about consistency. If a vehicle arrives outside its slot, it waits, or it is rebooked to the next available time. Apply this without exception for a month and most carriers will adjust. Apply it to some and not others and it means nothing.

A short penalty clause in your haulier terms, covering the direct cost of a missed slot rather than a punitive sum, is worth adding if you use contracted carriers. It does not need to be large. The point is to make the window a contractual fact rather than an aspiration.

Where you have good relationships, a short conversation with the transport manager is often more effective than any written policy. Explain what a missed slot actually costs, not in terms of inconvenience but in terms of wasted bay time and downstream disruption. Most transport managers would rather their drivers kept the slot than deal with rebooking calls.

Getting the dock ready first

None of this works if the dock is not ready when the vehicle arrives. A lorry waiting twenty minutes to be directed to a bay will not keep slots reliably. Drivers talk to each other, and the word gets round that it makes no difference either way.

Clear bay allocation, visible signage, and a check-in process that takes under two minutes are the basics. If your dock regularly runs behind because of paperwork, missing documentation, or goods that were not put away from the previous shift, those are the problems worth fixing first.

The diagnostics tool gives you a structured way to identify where dock time is actually going before you start redesigning the schedule. The answer is usually different from what people assume.

If you are working through the wider goods-in process, the toolkit includes carrier communication templates and a slot calculation worksheet that saves the back-of-envelope work.