When does detention free time start? Whenever your contract says it starts. No federal rule sets the trigger for truckload detention. It is a negotiated term, and the exact words in your rate confirmation or master transportation agreement decide whether a driver who showed up ninety minutes early is sitting on your dime or his own.
That is the whole fight, and almost nobody reads the clause until the invoice is in dispute. Two carriers can bill the same load, at the same free time and hourly rate, and land more than a hundred dollars apart because one starts the clock at the appointment and the other at arrival.
The trigger is a contract term, not a law
Say this before you argue a detention line: no 49 CFR section tells a truckload carrier when free time begins. FMCSA regulates hours of service, not accessorial clock starts. What exists instead is a chain of private documents (the rate confirmation, the master agreement, the carrier’s rules tariff) defining the trigger, the free time, the rate, and the billing increment. Detention sits in the same negotiated family as layover, redelivery and storage, defined by tariff language rather than regulation.
Two consequences. First, “the industry standard is two hours from arrival” is not an argument, it is a preference. If your paperwork says appointment time, appointment time wins. Second, it is negotiable in both directions, and clock triggers are cheap concessions to ask for because they cost the carrier nothing on a load that runs on time.
Federal rules do bite on the deadline for contesting a bill. Under 49 U.S.C. 13710, a shipper has 180 days from receipt of the original bill to contest it and preserve the right to challenge. That clock is real even when the detention clock is not. Our reference table of every freight billing deadline has the rest.
The five clock triggers, and what each one means at the gate
Scheduled appointment time
Free time begins at the appointment on the rate con, no matter when the truck shows up. An 08:00 appointment starts the clock at 08:00 whether the driver rolled in at 06:15 or 08:45.
The most shipper-favorable convention in common use. It puts the cost of early arrival on the carrier and removes any incentive to park at the gate at dawn to bank hours. Its weak spot is late arrival: a driver who shows at 09:30 for an 08:00 appointment and leaves at 10:15 has, read naively, run 2 hours 15 minutes against a 2-hour window. Well-drafted appointment clauses carve that out.
Driver arrival at the facility
Free time begins when the tractor reaches the facility: the property line, the yard entrance, or “the shipper’s or consignee’s premises.” The most carrier-favorable of the common triggers, and the usual default in a carrier’s own rules tariff.
Its problem is evidentiary. A property line is rarely timestamped by anyone but the driver, so it gets proven with a driver-entered macro or a geofence ping, both contestable. If your contract uses arrival, you are agreeing to argue against the carrier’s own telematics.
Gate-in or check-in at the guard shack
Free time begins at the gate transaction: the guard log entry, the kiosk check-in, the gate ticket. Roughly the same moment as arrival, but one somebody else recorded, which is why it shows up in well-drafted contracts. It also creates a gap on sites with a long queue outside the gate, since time in the street waiting to reach the guard is on nobody’s clock. Carriers hate that gap. Expect to hear about it.
Signed in at the receiving office
Free time begins when the driver presents paperwork at the shipping or receiving office. That is later than gate-in on any campus where the guard shack sits a quarter mile from the dock office. Defensible on a large site, indefensible on a small one. The honest version pairs it with a cap: “check-in at the receiving office, or thirty minutes after gate-in, whichever is earlier,” so a driver is not charged for a yard he does not control.
Arrival or appointment, whichever is later
The hybrid. Free time begins at the appointment or at actual arrival, whichever occurs later. This is the most common negotiated compromise and, in practice, the fairest of the five. Early arrival costs the shipper nothing because the clock waits for the appointment. Late arrival costs the shipper nothing because the clock waits for the truck. If you make one change to your accessorial schedule this year, this clause is usually it.
When does detention free time start on an early arrival: one load, five triggers
The early arrival separates the conventions. On a truck that arrives exactly at the appointment, all five produce the same number. One load, run through all of them. The facts: appointment 08:00. Driver reaches the property line at 06:30. Gate-in at the guard shack 06:45. Signs in at the receiving office 07:10. Departs loaded at 11:00. Free time is 2 hours, detention is $75 per hour, billed in 15-minute increments rounded up.
| Clock trigger | Clock starts | Free time ends | Detention billed | Charge |
|---|---|---|---|---|
| Scheduled appointment time | 08:00 | 10:00 | 1.00 hr | $75.00 |
| Driver arrival at facility | 06:30 | 08:30 | 2.50 hr | $187.50 |
| Gate-in at guard shack | 06:45 | 08:45 | 2.25 hr | $168.75 |
| Signed in at receiving office | 07:10 | 09:10 | 1.83 hr, rounded up to 2.00 | $150.00 |
| Arrival or appointment, later | 08:00 | 10:00 | 1.00 hr | $75.00 |
Same truck, same dock, same 4.5 hours on site. The bill ranges from $75.00 to $187.50, a $112.50 spread on one load, decided by a clause most people have never read. Run that across a month of detained loads and the trigger is worth more than whatever you clawed back on linehaul at the last bid.
Note also that arrival and gate-in, which people treat as interchangeable, sit $18.75 apart purely because of a fifteen-minute queue at the guard shack. On a site with a forty-minute gate line, that gap gets serious.
Free time and the trigger are one setting, not two
Free time duration is meaningless without the trigger, and negotiating one without the other is how shippers talk themselves into a worse deal. Three hours from driver arrival is worse than two hours from appointment for any carrier that habitually arrives early. A carrier offering “an extra hour of free time” in exchange for moving the trigger from appointment to arrival is offering a discount that costs them only on loads they ran on time anyway.
Price the pair together. Take last quarter’s detained loads, pull the timestamps, and rerun both proposals. The cheaper combination is not always the one that sounds more generous.
The billing increment is the third leg. Trigger and free time set when the meter turns on; the increment sets how coarsely it counts. Fifteen-minute increments rounded up cost you up to fourteen minutes per load. Full-hour increments, fifty-nine.
Where the clause lives, and which document wins
The trigger language can appear in three places, and they routinely disagree.
The rate confirmation is load-specific and usually the shortest. On a broker-issued rate con the detention terms are often two lines near the bottom: “Detention: $75/hr after 2 hours, must be documented on the BOL with in/out times.” Many name the rate and the free time but never the trigger, which is exactly the ambiguity that produces disputes.
The master transportation agreement is the durable contract. It usually holds the full accessorial schedule plus an order-of-precedence clause covering what happens when a rate con conflicts with it. Read that clause. Most say the rate con controls for the specific load and the master agreement controls whatever the rate con is silent on, but plenty say the reverse.
The carrier’s published rules tariff is the document nobody reads and everybody is bound by. Truckload and LTL carriers alike publish tariffs defining accessorials in detail, and contracts incorporate them by reference in one sentence. If your agreement says “accessorial charges per Carrier’s Rules Tariff in effect on the date of shipment,” you have agreed to a definition of arrival you have never seen, one the carrier can revise without asking you.
Which controls? Whatever the order-of-precedence clause says. Absent one, the general rule of contract interpretation is that the specific beats the general and the later-agreed beats the earlier, so an explicit trigger on the rate con usually beats a rules-tariff default. “Usually” is doing real work there. The cure is to get the trigger into the master agreement, so it is not decided per load by whoever drafted the rate con that morning.
Two things to check on incorporation by reference. Does the contract pin a version, or float to whatever the carrier publishes today? Floating lets the carrier move your clock trigger unilaterally. And has the carrier actually given you the tariff? Asking in writing is a reasonable first move.
How to find the trigger in your own paperwork
Fifteen minutes, one load, three documents.
- Open the rate con for a load you know sat. Search “detention,” “free time,” “loading,” “unloading,” “waiting.” Read the whole sentence, not the dollar figure.
- If it names a trigger, write it down verbatim. If it names only a rate and a duration, the trigger lives elsewhere.
- Open the master agreement. Find the accessorial schedule and the order-of-precedence clause. Search the same terms plus “arrival,” “appointment,” “check-in,” “tariff.”
- If the agreement incorporates a rules tariff, ask the carrier for the current version in writing. Save the reply; the request is useful evidence later.
- Compare against what the carrier billed. A freight bill has to show the nature and amount of each charge under 49 CFR 373.103, so an invoice that starts the clock at a time no document supports is a defect, not a disagreement.
Then check the proof. A trigger you cannot evidence is worse than a trigger you dislike, and gate-in with no gate log is not a trigger, it is a claim. Laneproof’s walkthrough of detention disputes puts the rate confirmation first for exactly this reason. The full document set is in the minimum evidence package for a detention claim, and the case where the POD arrives with no in and out times is the most common failure in this cluster.
Ocean demurrage and detention run on different rules
Everything above is truckload. Container-side charges are a different regime with the same vocabulary, and the confusion is constant. Ocean demurrage generally covers a container sitting inside the terminal past free time; ocean detention covers a container out of the terminal past free time. Those charges are governed in part by federal regulation. 46 CFR part 541 sets billing requirements and practices for these invoices and imposes deadlines truckload detention has no equivalent of:
- The invoice must issue within 30 calendar days from the date the charge was last incurred (46 CFR 541.7).
- The invoice must state the timeframes for requesting fee mitigation, refund or waiver and for the billing party to resolve that request (46 CFR 541.6).
- The billed party gets at least 30 calendar days from issuance to make that request, and the billing party must attempt to resolve it within 30 days of receipt, or longer by agreement (46 CFR 541.8).
None of that applies to a truckload carrier billing four hours at a dock in Memphis. Do not cite Part 541 at a dry van carrier; it costs you credibility in a dispute you might otherwise win. What does transfer is the mental model. On the ocean side, free time start comes from the terminal tariff and the carrier’s published free time rules rather than a per-load rate con. Same lesson, different paperwork: find the governing document, then read the trigger.
What to negotiate, and how each side should play it
The trigger is easier to move than the rate. A carrier defending an $85 per hour detention rate is defending revenue. A carrier defending an arrival trigger is defending a windfall on early arrivals, a much softer position.
If you are the shipper
Ask for “arrival or appointment, whichever is later” as your default. Carriers understand it, and it does not ask them to absorb anything on a load that runs to schedule.
Then pin the evidence. Name the timestamp source in the contract: gate log, kiosk record, or a signed BOL with in and out times entered by facility staff, which is why electronic BOL timestamps end more of these arguments than any clause does. A trigger with a named evidence source beats a better trigger with no proof, for the same reason a liftgate charge falls apart when the BOL contradicts the rate con: the document decides it.
Finally, kill the floating rules tariff reference. Pin the version, or pull the definitions you care about into the agreement itself.
If you are the broker
You are exposed on both sides of the same load. Your carrier agreement and your customer agreement can define the trigger differently, and when they do, you eat the difference on every detained load with no way to pass it through. If the customer says appointment and the carrier’s rules tariff says arrival, you have bought a per-load liability that surfaces only at settlement, by which point the customer has already declined the charge. Reconcile the two before you sign either.
On the rate con, state the trigger explicitly on every load, even when the master agreement covers it. One line converts an interpretive dispute into a documentary one, which is the fight you would rather have.
What to actually do
- Pull one detained load and read the detention sentence in the rate con word for word. Write down the trigger, the free time, and the increment.
- If the rate con is silent on the trigger, find where it is defined: the master agreement, or an incorporated rules tariff.
- Ask the carrier in writing for the current rules tariff. Keep the reply.
- Rerun last quarter’s detained loads under the trigger you have and the one you want. Decide with the dollar figure.
- Ask for “arrival or appointment, whichever is later” at renewal, and name the timestamp source in the same clause.
Sources
- 49 U.S.C. 13710, the 180-day window to contest a freight bill.
- 46 CFR part 541, ocean demurrage and detention billing requirements.
- 46 CFR 541.6, required invoice timeframes.
- 46 CFR 541.7, the 30-day issuance deadline.
- 46 CFR 541.8, the 30-day request and resolution windows.
- 49 CFR 373.103, what a freight bill must show.
- Ziplinelogistics accessorial taxonomy, practitioner definitions.
- Laneproof, detention charge disputes, the rate con as source of trigger language.
- Vector, calculating detention fees, electronic BOL timestamps as evidence.