What is Detention?

Detention is the charge a carrier bills when its truck and driver are held at a shipper's or receiver's dock beyond the free time the contract allows.

A truck books an unloading appointment, arrives on time and then sits. Nothing about the freight changes while it waits — same pallets, same destination, same driver. What changes is the invoice.

Where detention is agreed, and who owes it

Detention is settled twice: agreed in advance on the rate confirmation — free time per stop, the rate charged after it, any cap — and billed afterwards as one accessorial line carrying a start time, a stop time and arithmetic nobody re-does.

Who owes it is a contract question, not a fault question: the carrier bills the party that hired it, so a shipper whose customer's dock ran late pays first and recovers from the receiver only if a second agreement lets it.

Two costs of the same wait land differently. Where a shipper or receiver requires that the driver be assisted in loading or unloading, federal law makes that party responsible for providing the assistance or for what it costs the operator to secure it^[assist] — the lumper. The waiting itself has no such rule. And whether the driver is paid for the wait is a third agreement: the carrier's pay policy, or an owner-operator's lease.

What starts the clock, and what stops it

Four terms decide the number, all of them written into the rate confirmation or the schedule behind it.

Reference time settles most arguments: a driver who reaches the gate early has not started the clock, and one who arrives late has usually forfeited the appointment, not begun billing. The clock stops when the vehicle is released, not when the dock door closes.

Dwell and detention measure different things: dwell is the whole time on site, detention only the billable part, so a site can report improving dwell while its detention spend climbs. The wait costs the day as well: a driver may not drive after 14 consecutive hours on duty^[hos], so an hour at a dock is an hour off the driving window. No federal rule sets free time for a motor carrier; the nearest thing is a direction to measure it, Congress having told the Secretary of Transportation in 2015 to establish, within 2 years, a process for collecting data on delays before loading and unloading^[assist].

Detention, demurrage, and the mode that owns the word

On the road the thing held is the carrier's equipment and the driver in it. On the water the same two words divide differently: demurrage runs on cargo left inside the terminal past its free time, detention on the container once it has left. Both are regulated to the invoice line — an ocean carrier may not bill either unless the invoice shows the charge complies with Federal Maritime Commission rules, and an invoice missing what the statute requires eliminates the obligation to pay^[ocean]. Nothing equivalent binds a motor carrier's detention invoice.

A drayage move is where a road operator meets all of it: one container, two clocks and two rulebooks on the same day. It is also where this entry stops: Shyftbase works land-based freight and does no ocean, port or customs work, so the road meaning governs here, and demurrage on the water has its own entry in the freight glossary.

What a detention dispute turns on

Almost no detention dispute is about the definition. Three questions settle them.

Whose timestamps? The claim is built from the carrier's own arrival and departure, and where the site kept no record of its own there is nothing to test it against: a signature on the bill of lading fixes the day, not the minute the vehicle reached the gate.

Does the arithmetic reproduce? Reference time, free time, increment, cap: either the line rebuilds from the four, or it is a number somebody typed.

Was the appointment kept? A carrier arguing from outside its own window is arguing about a clock that never started.

All three turn on what was captured, which puts the work upstream of the invoice: record arrival and departure where the waiting happens — the job of a track and trace record — and rate the completed service against the contract's own table, which is what automated freight billing and carrier and driver settlement are for.

The limits of this definition

The contract outranks the dictionary. Federal law is explicit that a carrier and a shipper may contract for specified services at specified rates and conditions, and may expressly waive most rights and remedies in writing^[contract]. Detention lives inside that agreement: free time, rate and cap are what the paperwork says, and where it and this page disagree, the paperwork wins.

Common practice is not a standard. The two-hour allowance operators quote each other is a habit of contracts, not a rule; a customer who has never granted it is in breach of nothing.

The word moves with the mode. Rail bills a held car as demurrage, not detention; on the water the pair divides cargo from container.

A definition is not a billing system. Naming the charge does not collect it. Unless the arrival and the departure landed somewhere the rate table can read them, detention is a story about a Tuesday.