Key Takeaways
- ATRI found detention at 39.3% of surveyed drivers' stops in 2023, including waits of more than two hours at 9.9% of stops.
- Carriers invoiced customers for 75% of detention incidents, and customers paid only 55% of those invoices in ATRI's carrier survey.
- A modeled 1,000-stop operation would produce about 393 detention records, 295 invoices, 162 paid invoices, and 133 billed but unpaid invoices if it matched ATRI's overall rates.
- The 2024 ATRI study estimated $3.62 billion in unreimbursed detention costs and $11.5 billion in lost productivity across three for-hire trucking sectors in 2023.
- A reliable audit queue needs contract terms, appointment and gate times, proof of delivery, communications, invoice status, dispute reason, and follow-up dates.
Freight detention invoice audit workload starts before anyone creates an invoice. A driver arrives, the detention clock depends on the contract, arrival and departure times need support, and someone must decide whether the event qualifies. The billing team then has to assemble the record, send the charge, answer a rejection, and track payment.
That chain produces a larger workload than the invoice count alone suggests. The best national benchmark now available is the American Transportation Research Institute's 2024 detention study. ATRI surveyed 587 drivers and 245 for-hire motor carriers about 2023 operations. It found detention at 39.3% of stops, but carriers invoiced only 75% of detention incidents and received payment on only 55% of those invoices (ATRI, 2024).
This page translates those findings into an invoice audit workload. Source facts and Stealth Agents calculations are separated so teams can replace the assumptions with their own stop volume, contract rules, and fee schedule.
Freight detention invoice audit statistics at a glance
| Workload measure | Published benchmark | What an audit team should expect |
|---|---|---|
| Stops with detention | 39.3% | A detention record may need review at roughly 4 in 10 stops |
| Stops with more than two hours of detention | 9.9% | About 1 in 10 stops crossed ATRI's conservative two-hour threshold |
| Detention incidents invoiced | 75% | One quarter of incidents did not become invoices |
| Invoices paid | 55% | Nearly half of billed detention fees remained unpaid |
| Paid incidents as a share of all incidents | 36.0% to 45.9% by sector | A completed detention event often does not become collected revenue |
| Median hourly fee | $50 truckload, $60 refrigerated, $80 specialized | Fee schedules differ by sector and remain below lost revenue per hour |
| Annual detention per driver or truck | 117.5 to 209.4 hours | The backlog can recur throughout the year, not only during peak weeks |
| Direct unreimbursed cost | $3.62 billion | Missed and unpaid detention has measurable carrier cost |
The first seven figures come from ATRI's 2024 report and its 2023 operating data. The $3.62 billion estimate covers refrigerated, specialized, and truckload for-hire operations. ATRI excluded less-than-truckload fleets and owner-operators from that economic calculation (ATRI, 2024).
What counts as detention in these statistics
Detention definitions are not uniform. ATRI treated time beyond two hours at a customer facility as detention for its economic analysis because 67% of surveyed carriers that charged detention began the fee at the two-hour mark. Another 12% began at one hour, while 6% began at three hours (ATRI, 2024).
The earlier Federal Motor Carrier Safety Administration study used the same common threshold. Its 2014 dataset covered more than 1.3 million stops from about 31 carriers supplied by two telematics vendors. The study found an average 1.4 hours of detention beyond the first two hours, with refrigerated carriers averaging 1.74 hours (FMCSA, 2014).
An invoice audit should therefore use the contract or rate confirmation as its authority. A national average cannot decide whether a particular charge begins after one, two, or three hours. It can only show how much review volume a typical rule may create.
A 1,000-stop workload model
The following example applies ATRI's overall survey rates to 1,000 annual pickup and delivery stops. These are Stealth Agents calculations, not counts reported by ATRI.
| Audit stage | Calculation | Modeled annual volume |
|---|---|---|
| Stops with some detention | 1,000 × 39.3% | 393 records |
| Detention incidents invoiced | 393 × 75% | 295 invoices |
| Invoices paid | 295 × 55% | 162 paid invoices |
| Billed invoices not paid | 295 minus 162 | 133 invoices |
| Detention incidents not invoiced | 393 minus 295 | 98 incidents |
| Total incidents without collected fees | 98 plus 133 | 231 incidents |
Rounding each stage to whole records means the displayed figures may differ by one from a calculation performed without intermediate rounding.
This model does not prove that every unpaid invoice is recoverable. Some events may fail a contract condition, arrive late, lack support, or remain unpaid for a commercial reason. It does show the size of the queue that deserves a coded outcome. For every 1,000 stops, the model produces 393 records to qualify and 231 detention incidents for which no fee is collected.
The 2023 OOIDA Foundation survey offers a useful comparison for small operators. Among its predominantly owner-operator respondents, 49% attempted to receive detention compensation and those who tried received it on about 25% of detained loads (OOIDA Foundation, 2024). The population differs from ATRI's carrier economic analysis, so the two rates should not be merged. Together, they show that billing and collection gaps are not limited to one fleet type.
Invoice volume changes sharply by freight sector
ATRI found detention at 56.2% of refrigerated stops, 32.6% of truckload dry van stops, 26.2% of flatbed stops, and 19.3% of specialized stops in the 2023 driver survey. Spot market freight also had a higher detention rate than contract freight in the carrier survey, 42.5% compared with 33.8% (ATRI, 2024).
The audit implication is practical. A refrigerated fleet should not staff its detention queue from an all-freight average. Neither should a broker assume contract and spot loads create the same exception rate. Weekly forecasts should separate at least equipment type, customer, facility, and contract channel.
ATRI's annual estimates reinforce that difference. It calculated 209.4 detention hours per refrigerated driver or truck, 173.0 hours for truckload, and 117.5 hours for specialized operations. The resulting share of incidents with detention fees paid was 36.0% for refrigerated carriers, 43.5% for truckload carriers, and 45.9% for specialized carriers (ATRI, 2024).
The documentation gap is a field-level problem
ATRI reported that most carriers do not track true detention time at each stop under a common standard. Carriers usually have total dwell time through GPS or electronic logging devices, but total dwell also includes legitimate loading and unloading activity (ATRI, 2024). FMCSA reached a similar caution in 2024 when it described the need for a broader study that distinguishes waiting from activities performed on site (U.S. Department of Transportation, 2024).
A defensible detention record usually needs these fields:
| Record | Audit question |
|---|---|
| Contract or rate confirmation | What is the free-time threshold, hourly rate, minimum increment, and notice rule? |
| Appointment record | Did the truck have a confirmed appointment and arrive on time? |
| Arrival evidence | Which timestamp starts the facility visit? |
| Free-time calculation | When did billable detention begin under the agreement? |
| Departure evidence | Which timestamp ends the charge? |
| Bill of lading or proof of delivery | Do signed times agree with the driver's, ELD's, or GPS record? |
| Notice history | Was the broker, shipper, or receiver notified within the required window? |
| Invoice and revised rate confirmation | Does the amount match the approved rate and duration? |
| Dispute code | Was the charge rejected for lateness, missing proof, rate mismatch, duplication, or another reason? |
The point is not to collect every possible attachment. It is to capture the evidence required by that customer's terms. A checklist without contract logic can create more review work while still missing the one document needed for payment.
Dispute and nonpayment rates need separate tracking
ATRI found that carriers invoiced 75% of detention incidents and received 55% of billed fees. That leaves two distinct gaps: events never billed and invoices not paid. Combining them under a single "denied" label hides the fix.
Unbilled incidents may be below a billing increment, tied to a late arrival, missing records, intentionally waived for a customer, or judged too small to pursue. ATRI also noted that some small carriers avoid pressing important accounts. In its survey, every responding fleet with more than 50 trucks charged detention fees, compared with 92% of fleets with 50 or fewer trucks (ATRI, 2024).
An unpaid invoice needs a different set of codes. It may be pending, disputed, rejected, short-paid, credited, or written off. The audit should preserve the customer's stated reason and the next action. Otherwise, a documentation defect and a collection delay look identical in the monthly total.
A historical DAT survey illustrates how hard payment was before the latest ATRI benchmark. In 2016, 63% of the surveyed drivers reported waits longer than three hours, while only 3% of carriers said they were paid on at least 90% of detention claims. Reported payments ranged from $30 to $50 per hour (DAT, 2016). The survey is not a current rate card, but it provides a useful earlier reference for persistent collection trouble.
Cycle time is bounded by operational and billing clocks
There is no single published national average for over-the-road detention invoice review time. Teams should measure their own cycle in stages:
- Event end to document receipt
- Document receipt to qualification decision
- Approval to invoice submission
- Submission to first customer response
- Dispute open to resolution
- Approval to cash receipt
The operational clock matters because detention consumes regulated working time. FMCSA permits a property-carrying driver to drive for up to 11 hours within a 14-hour window after 10 consecutive hours off duty. Off-duty time generally does not extend that 14-hour period (FMCSA hours-of-service summary). ATRI found that 52% of surveyed truckload drivers ran out of on-duty hours at a customer facility because of detention at least once in 2023, while 57.8% were late to or canceled a later appointment because of detention at a previous facility (ATRI, 2024).
The billing clock differs by market and contract. Ocean detention and demurrage are governed by specific federal requirements that should not be applied to ordinary truck detention. Under the Federal Maritime Commission's 2024 rule, vessel-operating common carriers and marine terminal operators generally have 30 calendar days after charges stop accruing to issue invoices. Billed parties receive at least 30 days to request mitigation, a refund, or a waiver, and billing parties generally have 30 days to attempt resolution (FMC, 2024).
That maritime rule also shows why invoice completeness matters. An invoice that omits required information does not create an obligation to pay the applicable charge under the rule. Road carriers should still follow their own contracts, but both settings reward prompt, complete records.
Recoverable cost is smaller than total detention cost
ATRI's 2023 economic estimates separate collected fees from the underlying cost. Median hourly detention fees were $50 for truckload, $60 for refrigerated, and $80 for specialized fleets. Estimated revenue per hour excluding fuel was $99.54, $111.32, and $131.83 respectively. Even a paid invoice therefore left roughly $50 to $52 per hour in foregone revenue in ATRI's model (ATRI, 2024).
ATRI estimated $11.5 billion in lost productivity and $3.62 billion in direct unreimbursed costs across refrigerated, specialized, and truckload operations in 2023. It also estimated $286.1 million in diesel cost from 72.6 million gallons burned while idling during detention (ATRI, 2024).
Those are industry estimates, not an accounts receivable balance. A carrier's recoverable amount is the sum supported by its agreements and evidence. A useful internal estimate is:
| Measure | Formula |
|---|---|
| Qualified unbilled value | Eligible unbilled hours × contracted fee |
| Disputed value with complete support | Supported disputed hours × contracted fee |
| Documentation opportunity | Potentially eligible hours missing a required record × contracted fee |
| Total addressable queue | Qualified unbilled value plus supported disputed value |
| Recovery rate | Cash recovered from audited items ÷ total addressable queue |
Keep the documentation opportunity separate. Missing proof may be fixable, but it is not yet a collectible asset.
The public cost estimates also have safety context. The U.S. Department of Transportation Office of Inspector General estimated in 2018 that an additional 15 minutes of average dwell time was associated with a 6.2% increase in expected crash rate. Its analysis also estimated annual driver income losses of $1.1 billion to $1.3 billion and carrier net income losses of $250.6 million to $302.9 million in the for-hire truckload sector, using 2013 data (DOT OIG, 2018). These older figures should not be added to ATRI's 2023 totals because the studies use different years and methods.
A weekly audit scorecard
A detention invoice team can manage the workload with a compact scorecard.
| Metric | Definition |
|---|---|
| Detention event rate | Detention records ÷ completed stops |
| Qualification rate | Eligible events ÷ reviewed detention records |
| Documentation-complete rate | Eligible events with all required support ÷ eligible events |
| Invoice capture rate | Submitted invoices ÷ eligible events |
| First-pass acceptance rate | Invoices approved without rework ÷ submitted invoices |
| Dispute rate | Disputed invoices ÷ submitted invoices |
| Collection rate | Paid invoices ÷ submitted invoices |
| Median event-to-invoice time | Median elapsed time from departure to submission |
| Median dispute age | Median days open for unresolved disputes |
| Recovered value | Cash received from previously unbilled or disputed items |
Break the measures out by customer, facility, broker, equipment type, and denial reason. An overall collection rate can improve while one high-volume facility keeps generating preventable missing-time disputes.
Where freight invoice audit support fits
The repeatable work includes intake, contract lookup, timestamp comparison, proof-of-delivery matching, calculation checks, invoice assembly, portal submission, dispute logging, follow-up, and weekly reporting. A documented queue also helps the carrier preserve customer-specific rules instead of relying on one employee's inbox.
Commercial judgment should remain with the carrier or broker. That includes waiving a valid fee for a strategic account, interpreting ambiguous contract language, approving a settlement, or changing a customer's terms. The support role prepares a complete record and brings exceptions to the authorized decision maker.
Teams that want to separate this workflow can start with the freight invoice audit virtual assistant guide and the broader business process outsourcing guide. The adjacent logistics proof-of-delivery reconciliation workload statistics page covers the document-matching work that feeds many detention reviews.
Frequently Asked Questions
What should count as a detention invoice audit action?
Track document collection, appointment and timestamp reconciliation, rate validation, exception contact, approval routing, dispute follow-up, and closure as separate actions.
Why preserve original timestamps and documents?
Detention charges depend on event sequence and contract terms. Original evidence supports a defensible approval or dispute when system records conflict.
Related operational research
See trucking industry staffing costs and supply chain outsourcing statistics for adjacent context.
Method and source notes
This article uses the latest comprehensive U.S. carrier and driver detention study found during verification, ATRI's September 2024 report using 2023 data. The sample included 587 drivers and 245 for-hire motor carriers. It was a convenience sample, although ATRI tested online against in-person driver responses and compared carrier dwell time with a separate operational-cost dataset. ATRI reported no statistically significant differences in those checks (ATRI, 2024).
The 1,000-stop table is a scenario calculation based on ATRI's overall rates. It is not a forecast for every carrier. Actual workload depends on sector, customer mix, facility behavior, contract thresholds, evidence quality, and billing policy.
Sources consulted and cited on this page:
- American Transportation Research Institute, Costs and Consequences of Truck Driver Detention, 2024
- Federal Motor Carrier Safety Administration, Driver Detention Times in Commercial Motor Vehicle Operations, 2014
- U.S. Department of Transportation Office of Inspector General, Estimates Show Commercial Driver Detention Increases Crash Risks and Costs, 2018
- Owner-Operator Independent Driver Association Foundation, 2023 Detention Time Survey, published 2024
- Federal Motor Carrier Safety Administration, Summary of Hours of Service Regulations
- U.S. Department of Transportation, Impact of Driver Detention Time on Safety and Operations, 2024
- Federal Maritime Commission, Demurrage and Detention Billing Practices final rule summary, 2024
- Federal Maritime Commission, Detention and Demurrage data
- DAT Solutions, carrier and driver detention survey, 2016
The Federal Maritime Commission data series is limited to nine ocean carriers and covers container detention and demurrage, not ordinary truckload detention. The Commission reports that those carriers collected about $15.4 billion from April 1, 2020, through March 31, 2025 (FMC detention and demurrage data). It is included to show the scale and stricter invoice controls of the maritime lane, not as a truck detention recovery estimate.
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