Detention on flatbed loads: what the wait costs and how to cut it

Detention starts with an agreed clock

Detention is driver waiting time after negotiated free time at pickup or delivery. Two hours from facility check-in is common in flatbed contracts, but FMCSA Hours of Service guidance does not create a universal detention tariff. The rate confirmation controls whether the clock starts at the gate, security desk, appointment time, or dock check-in.

Published flatbed tariffs put detention at $80 to $150 an hour after two free hours. Landstar’s rules tariff lists $80 an hour for a standard flatbed or step-deck, capped at $500 per 24-hour day (effective 2020). Melton Truck Lines lists $150 an hour, billed in 15-minute increments, capped at $900 per 24-hour day (effective 2023). If a missed crane window adds four hours, that is $320 to $600 in detention at those rates, before layover or rescheduling. Write down the rate, free time, start event, evidence required, and exclusions before the truck rolls.

The U.S. DOT Office of Inspector General estimated in 2018 that each 15-minute increase in a truck’s average time at a facility raises the expected crash rate by 6.2 percent, and that detention costs for-hire truckload drivers $1.1 billion to $1.3 billion a year in lost earnings.

In a 2024 ATRI study, drivers reported being detained, meaning held more than two hours, at 39.3 percent of stops in 2023. Almost every fleet (94.5 percent) charges detention, but fewer than half of those invoices get paid.

Why flatbed freight waits longer

A van backs to a door, a forklift loads, the doors close, and the truck leaves. A flatbed needs a crane or heavy forklift, dunnage, coil racks, blocking, chains, binders, edge protection, tarp work, and a securement inspection. Each step can be delayed independently.

Steel mills create hard dependencies around crane windows. Missing one can add two to six hours or a next-morning slot. At a jobsite, the equivalent problem is a blocked access road, absent crew, unfinished foundation, or another truck occupying the unload position. Weather can stop tarping even when the freight is already on the deck.

Document the paper trail

A defensible detention file has four records:

• Driver check-in log: the driver’s timestamp, facility, gate, truck number, and appointment.
• Facility gate record: security log, kiosk receipt, dock scan, or signed time-in/time-out sheet.
• Carrier invoice: load number, free-time expiration, hourly rate, billed hours, and reason.
• Shipper log: dispatch ETA, appointment confirmation, driver messages, crane call, and departure event.

When records agree, approval is simple. If the driver says 8:00 and the gate log says 8:22, use the contract’s definition of check-in and ask for supporting proof. If the carrier bills four hours but the facility signed departure after 2.5 hours, dispute the excess with the documents. A voluntary meal break, wrong gate, missing PPE, or wrong trailer should generally not be billed as shipper-caused delay.

Do not erase the dispute by rejecting every invoice. Approve valid time, explain the excluded interval, and retain the correspondence. A repeatable evidence rule improves carrier relationships and gives procurement credible facility data.

The P&L math

Scenario	Total time	Free time	Detention	Cost at an assumed $100/hour
Scheduled crane load	2 h 20 m	2 h	0.33 h	$33
Missed crane window	6 h 30 m	2 h	4.5 h	$450
Jobsite not ready	5 h	2 h	3 h	$300
Tarp removal at delivery	3 h 15 m	2 h	1.25 h	$125

Assume 100 loads a month, each held 1.5 hours past free time at $100 an hour: that is $15,000 a month. Assume 400 loads a month, half of them detained at an average of $400 each: that is $80,000 a month, or $960,000 a year. Neither figure counts missed delivery appointments or driver hours lost under 49 CFR Part 395.

Worked manufacturer scenario

Assume a regional manufacturer ships 240 flatbed loads a year. Before any scheduling changes, 60% of its loads are detained and the average approved detention charge is $420. Annual detention is 240 × 0.60 × $420 = $60,480. Assume it also pays $8,000 for four missed crane or jobsite appointments, for a total waiting-related cost of $68,480.

The shipper confirms appointments 24–48 hours ahead, verifies racks, sends a 30-minute ETA alert, and requires check-in and departure timestamps. Detained loads fall to 25%, and the average event drops to $260 because most remaining delays are short. New detention is 240 × 0.25 × $260 = $15,600. If missed appointments fall to $2,000, the total is $17,600. Annual savings are $50,880 before software or process labor.

Audit the facility, not just the carrier

A 90-day detention report should show load ID, carrier, origin, destination, appointment time, actual check-in, loading start, load complete, departure, free time, billed hours, rate, dollar amount, reason code, and whether the invoice was approved or disputed. Sort by facility and then by cause.

Chronic offenders are visible in several ways: the same facility appears in the top ten dollar spend, median load time exceeds free time, more than 30% of arrivals are detained, or missed crane windows cluster on one shift. Compare like freight; a machinery dealer’s three-hour crane unload should not be benchmarked against a lumber yard’s 45-minute forklift load.

Shippers have options. Present timestamps to facility management, request wider appointment spacing or an added crane shift, and move recurring volume to a better-performing lane. Where the delay cannot be fixed, set a facility-level rate: a known three-hour wait past free time may justify a fixed accessorial in the contract, which at $80 to $150 an hour is $240 to $450. Withholding lane volume works better than a complaint: reduce tender volume until the facility meets a measurable target.

The carrier’s perspective

Carriers often tolerate detention because they must complete the booked move and cannot leave steel or machinery unattended. The driver still has a truck payment, fuel cost, and a legal clock running. A six-hour wait can destroy the next day’s revenue.

When a shipper or facility is known to detain trucks, carriers price that history into future rates. The DOT Inspector General’s 2018 detention report cites a study finding that carriers charge higher rates to customers whose facilities hold trucks longer, and notes that 20 percent of respondents to a 2014 OOIDA member survey had negotiated higher rates to cover detention. As an illustration, a 500-mile lane that would price at $3.00 a mile might be quoted at $3.30, an extra $150 to cover two hours the carrier expects to wait without pay. Reliable shippers receive better equipment access and fewer refusals. Transparent detention terms are cheaper than pretending the cost does not exist.

Scheduling-based prevention

Pre-book crane windows, confirm coil racks, require an appointment before dispatch, and alert the facility from the carrier’s GPS ETA. Dock Optimizer can put appointment, check-in, ETA, and POD on one shipment link: flatbed workflow.

Use a monthly review to compare linehaul, detention, layover, and missed-delivery cost. A carrier quoting $200 less linehaul but creating $350 average detention is not cheaper. See dock scheduling and carrier vetting.

Sources

• Melton Truck Lines, General Carriage Rules MTLA 100-F (effective March 29, 2023). https://meltontruck.com/wp-content/uploads/2023/03/Melton-Truck-Lines-General-Carriage-Rules-Rev-3-29-2023.pdf
• Landstar, LAND 100-A Rules Tariff (effective March 2020). https://www.landstar.com/media/vduhe3j1/land-100-a-march-17-2020.pdf
• ATRI, New Research Documents Substantial Financial and Safety Impacts from Truck Driver Detention (September 2024). https://truckingresearch.org/2024/09/new-research-documents-substantial-financial-and-safety-impacts-from-truck-driver-detention/
• U.S. DOT Office of Inspector General, Estimates Show Commercial Driver Detention Increases Crash Risks and Costs (ST2018019, 2018). https://www.oig.dot.gov/sites/default/files/FMCSA%20Driver%20Detention%20Final%20Report.pdf