What Is Detention Time? (2026)

Key numbers at a glance

What Detention Time means

Definition: detention is a contractual charge for time — not miles — spent at a facility beyond the allowed free window. The standard structure: two free hours from your arrival (sometimes from your appointment time, which is why the trigger matters), then an hourly rate for each additional hour, often in full-hour increments, sometimes with a cap. Detention is negotiated between you and the broker or shipper before the load; there is no federal rate for it. FMCSA rules govern your hours of service (see FMCSA regulations), but no regulation requires anyone to pay you for dock time — the obligation comes entirely from the contract.

Distinguish detention from its cousins. Layover is pay for being stuck overnight or missing a reload because the shipper could not load you — a flat day rate. Tarping pay is compensation for securing flatbed freight. Detention is specifically the dock-time clock. All three share one rule: they are accessories to a rate confirmation, and an unwritten accessory is worth exactly what a verbal promise usually is.

The reason detention deserves a line item of respect: dock time is not rest. Your 14-hour driving window keeps running while you sit, so every detained hour is a legal driving hour you cannot buy back — often the difference between making the next pickup or deadheading into a penalty of its own (see what deadhead means for that cascade).

How Detention Time affects your numbers

A worked example. You take a 500-mile load at $2.00/mile — $1,000 gross, and your cost per mile is $1.20, so a nice $400 margin on paper. Then the receiver holds you five hours. Two are free; three bill at $50/hour if — and only if — detention was in the rate confirmation. With it: +$150, and the effective rate on 500 loaded miles rises from $2.00 to $2.30. Without it: $0, plus the lost afternoon. The same load, the same dock, and $150 separated entirely by one sentence written before dispatch.

What the hourly clock pays across a typical week of warehousing misery, at common negotiated rates:

Read the last row against reality: five detained hours at $50 adds $0.50/mile to a 500-mile load — a 25% rate bump that most carriers never collect because they never asked. The opportunity cost is often larger than the charge itself: three burned duty hours on a $2.00/mile truck that averages 50 mph is $300 of rolling capacity you gave the warehouse for free. Detention pay compensates for the dock; it does not resurrect the afternoon.

Common mistakes

Trusting "we always pay detention." The dock supervisor is not a party to your contract. The rate confirmation must state the hourly rate, the free-time allowance and the trigger — arrival or appointment. No sentence, no claim.

Arriving early and expecting the clock to start. Many facilities start detention at the appointment time, not when you showed up four hours early. The trigger definition is a negotiating point worth thirty seconds.

Submitting claims without a paper trail. In/out times from gate tickets, BOL timestamps, ELD or GPS geofence records — send the packet with the invoice. A detention claim without timestamps is a wish, and brokers process wishes last. If slow payment on approved claims becomes the pattern, that is a broker relationship problem, and sometimes a reason to route the invoice through factoring instead.

When it matters most

Detention matters most on short loads and tight schedules — the places where hours are worth more than miles. A 150-mile regional run at $2.50/mile earns $375; four detained hours at $50 adds $200, more than half the freight. It matters at facilities with known congestion: grocery warehouses, automotive plants, any dock with a queue at noon. And it matters at the margin: between two similar offers, the one with written detention terms at a real hourly rate is the better contract even at the same linehaul. Run the whole picture — rate, deadhead, fuel, detention — through the load profit calculator, and start from the HaulMath home page for the rest of the system.