A dock appointment is a promise. A door stamp is a fact. Almost every argument at a loading dock is really an argument about the gap between the two, and it cannot be settled because nobody recorded all four of the times involved. There are four: when the slot was booked for, when the vehicle actually arrived, when it actually got onto a door, and when it was released. Three gaps sit between them, and each gap has a different owner — the carrier owns arriving late, the facility owns the wait for a door, and the facility mostly owns what happens once the trailer is backed on. Capture all four and every dock KPI falls out of the arithmetic: on-time appointment rate, appointment wait time, dock dwell, turnaround and utilisation are not five separate measurements, they are five ways of subtracting one stamp from another. Capture none of them and you have a booking system, which schedules the promise and measures nothing. This matters commercially and not only operationally. Detention is charged far more often than it is paid — less than half of carriers who charge for it actually receive payment — and facilities with a reputation for holding drivers find the market prices them accordingly. As one carrier transportation executive puts it, those with a history of excessive delay time will often find that capacity will come at higher rates. This page covers the four stamps, who owns each gap, where wait time is actually created, and the record rule that stops a time being quietly restated afterwards. See appointment against actual, or start free on one dock.
Booking the Door Is the Easy Half. Measuring What Happened At It Is the Half That Settles Arguments.
For warehouse and dock managers, transport managers and site leads: how four timestamps produce every dock KPI you need, which gap belongs to the carrier and which belongs to you, and why a booking system on its own measures nothing.
No credit card required. Dock, yard, inspections and maintenance on one record.
The Anatomy of One Appointment
This is the whole page in one picture. Note where the time actually went, and note that the carrier owns eighteen minutes of a three-hour visit. Show me who caused the delay.
Illustrative load. The point is the proportions, which are typical in the sense that matters: the carrier's contribution to a long visit is usually small and highly visible, while the facility's contribution is large and invisible unless somebody stamped the moment the trailer got onto a door. A dock that only records booked time and released time can tell you the visit was three hours, and can tell you nothing about whose three hours they were.
Every Dock KPI Is a Subtraction
Once the four stamps exist, you do not choose which metrics to track. They are already there. Swipe the table on mobile.
| The interval | The KPI it produces | What it measures | Owner |
|---|---|---|---|
Booked → Arrived | On-time appointment rate | The percentage of carriers arriving inside their scheduled window | Carrier |
Arrived → At door | Appointment wait time | The average time a carrier waits for a door after arriving on time | Facility |
At door → Released | Dock dwell and turnaround | From the moment it docks until it departs, and the load or unload time inside that | Facility |
Door occupied over the day | Dock utilisation rate | The percentage of time a door is in use | Facility |
Arrived → Released | Total time on site | The number detention is calculated from, against the free window | Shared |
KPI definitions follow the standard set used across dock scheduling practice — on-time appointment rate as the share of carriers arriving inside their scheduled window, appointment wait time as the average wait for a door after arriving, dock dwell as the time from docking to departure, and dock utilisation as the percentage of time a door is in use. The ownership column is our attribution, not an industry standard, and it is the column worth arguing about with your carriers before you publish a scorecard built on it.
Live Load, Drop-and-Hook, and Why the Stamps Mean Different Things
The four-stamp model holds for both, but the gaps carry completely different weight — and a facility that reports one average across both is hiding its worst number inside its best.
The driver waits through every gap. Gap two is unpaid waiting and gap three is the load itself, so both count against the free window and both are visible to the carrier in their own telematics. This is where detention is generated and where a scorecard will judge you.
The trailer is dropped and a pre-loaded one taken away, so the driver is on site for minutes rather than hours. Gap three effectively disappears from the driver's clock — but it moves onto the yard, where a dropped trailer now occupies a slot and accrues its own dwell that nobody is measuring.
This is the most common reason a dock average looks healthy while carriers keep complaining. Blending drop-and-hook visits of twenty minutes with live loads of three hours produces a mean that describes neither, and it is the live loads that generate every detention invoice. Report them separately, or the number is decorative.
No-Shows, Late Arrivals and the Rules Worth Writing Down
Three policies decide whether a schedule survives contact with a real week. Each one is a decision about who absorbs the disruption, so make it deliberately rather than by default.
How far outside the window can a carrier arrive and still be worked in order? Set it explicitly. An unwritten grace period is applied inconsistently, and inconsistency is what carriers escalate about — not the rule itself.
A slot booked and not used is capacity destroyed, because nothing else could be booked into it. Decide whether it is released automatically after a set time, and whether repeated no-shows affect future booking priority.
What happens to a carrier who arrives on time to a site already running late. If the answer is "they wait", that is a choice to convert your delay into their detention claim — which is fine, as long as you know you made it.
Where the Wait Is Actually Created
Almost nobody creates wait time at the door. They create it in the booking pattern, hours earlier, by stacking appointments into the same two windows. Try it on one facility.
Illustrative utilisation. The shape is the familiar one: a morning peak, a midday collapse, an afternoon peak, and two doors that are never busy even when the others are saturated. When gap two is long on this site, the cause is visible here rather than on the dock — and the fix is a booking rule, not more labour. A site that cannot draw this chart will keep solving a scheduling problem with overtime.
Which of Your Sites Is the One Carriers Complain About?
If that is a matter of opinion in your business, the data does not exist yet. In thirty minutes we will set up one dock with the four stamps captured, and show you the wait broken down by day, by hour booked and by door — which is usually enough to find the fix in the first week.
How FleetRabbit Handles This
The Rule That Makes the Times Worth Anything
A door marked occupied at 10:46, re-opened at 15:00 by someone tidying up the day, and saved again — with the stamp now reading 15:00. The arrival has been restated, the dwell calculation is wrong, and nothing on the screen says so.
Only the change counts. Marking a door occupied stamps the moment of the change, and re-saving the same record cannot restate it. The real start and the real end are the pair the dwell is measured from, and neither can be moved by opening the screen again later.
This matters more than it sounds. A dwell figure is only usable in a commercial conversation if the timestamps behind it could not have been edited after the fact — which is exactly the question a carrier's transport manager will ask the first time you invoice them for a late departure, and exactly the question you should ask a facility invoicing you.
The Scorecard This Produces
Six lines, and five of them are about you rather than about your carriers. That is usually the surprise. Review my dock data with us. Swipe the table on mobile.
| Measure | Example | What it tells you |
|---|---|---|
| Average detention per stop, by location | 2 h 14 m | Which of your sites is actually the problem |
| Share of loads held beyond the free window | 31% | The number a carrier will quote back at you |
| Average wait by day of week | Mon 2 h 40 m · Thu 1 h 05 m | Usually a staffing pattern, not a dock problem |
| Average wait by hour booked | 09:00 slot 1 h 50 m | Which is an argument for moving the slot, not for more doors |
| On-time appointment rate | 78% | The one number that is genuinely the carrier's |
| Doors idle during peak | 2 of 8 | Capacity you already own and are not using |
Because capacity is priced on it. Carriers now monitor every component of a driver's tour of duty through electronic logs and telematics, and they build customer scorecards from it — average detention per stop by location, the share of loads held beyond a threshold, average wait by day and by hour. A facility with a history of excessive delay time finds that capacity comes at higher rates. The dwell you do not measure is being measured anyway, by the people quoting you.
Carrier scorecarding practice, the telematics monitoring quote and the capacity-pricing consequence are per Transport Topics' reporting on detention data, which also records that fewer than half of carriers who charge for detention actually receive payment. The two-hour free window and the detention cost figures behind it are per the US DOT Office of Inspector General's report on commercial driver detention and OOIDA's detention time survey. Keep dock events on the same unit record as the inspection report and the preventive maintenance schedule.
Dock Scheduling Questions Operations Teams Ask
What is dock appointment scheduling?
Booking carriers into time slots at specific doors so arrivals are spread rather than stacked. The booking half is straightforward; the half that changes anything is capturing what actually happened against each appointment, because a schedule with no actuals against it cannot tell you whether it worked. See both halves working.
What is the difference between dwell time and detention?
Dwell is the whole time on site. Detention is the part of it beyond an agreed free window, conventionally two hours, that becomes chargeable. Dwell is a measurement; detention is a commercial consequence of that measurement crossing a line. You cannot argue about the second without having recorded the first. Start recording it free.
How do I know whether a delay was the carrier's fault or ours?
By having four stamps rather than two. Booked against arrived is the carrier's on-time performance. Arrived against on-a-door is your wait time. On-a-door against released is your turnaround. With only a booking and a departure you have one number and no attribution, which is why these conversations go in circles. See the attribution on your own loads.
Which dock KPIs actually matter?
On-time appointment rate, appointment wait time, dock dwell, turnaround and door utilisation. All five come from the same four timestamps, so the question is not which to track but whether you are capturing the stamps at all. Utilisation is the one most often missing, and it is usually where the wait is being created. Get all five from one dock.
Can we reduce wait time without adding doors?
Usually, yes. Most long waits are made in the booking pattern rather than on the dock — appointments stacked into two peaks with a dead hour between them, while one or two doors sit idle throughout. A utilisation view by hour and door normally finds capacity you already own. Look at your pattern with us.
Can a dock time be edited after the fact?
It should not be able to be. Marking a door occupied or released stamps the moment of the change, and re-saving the record later must not restate it. If your system allows a tidy-up at the end of the day to move an arrival time, none of the numbers built on it will survive a commercial challenge. See how the stamps are held.
Should dock data connect to fleet maintenance?
On your own vehicles, yes — a unit that sat three hours at a door, has an open defect and is due a service are three facts about the same asset and belong on one record. For third-party carriers the value is the scorecard rather than the vehicle history. See it on one record.
Four Stamps Turn a Booking System Into a Measurement
FleetRabbit records the booked slot, the arrival, the door occupied and the door released as separate events that cannot be restated afterwards — so every dock KPI is a subtraction, every delay has an owner, and the result sits beside the same unit's inspection record and open work orders.
No credit card required. Start with one dock and one week of appointments.
