A trailer backs into the right distribution center at the right time, and then nothing happens. The driver waits. The dock assignment changes. A switcher searches the yard for an outbound unit that the system insists is already at a door. Somewhere else, a warehouse crew is ready to load a trailer it cannot find. Each delay looks small when considered on its own. Across a large network, they add up to a significant operating expense—and they reveal a weakness in how logistics productivity is measured.
We have become very good at optimizing freight that is moving. Transportation management systems select carriers and routes, warehouse management systems sequence work, and visibility platforms report shipment progress. Yet the handoff between a truck’s arrival and its eventual departure remains a surprisingly stubborn source of cost. The issue is not simply detention fees. It is the productive capacity of drivers, trailers, docks, labor, and yard equipment that disappears while everyone waits for the next decision.
A much bigger number than the detention invoice
The American Transportation Research Institute’s study of detention, using 2023 data and published in 2024, estimated $3.6 billion in direct industry expenses and $11.5 billion in lost productivity. It calculated more than 135 million hours of detention. These figures cannot be added indiscriminately to every shipper’s freight bill: they measure different consequences across the trucking industry, and the report also finds that fewer than half of detention fees were paid. But they do show why a narrow focus on invoice disputes misses much of the underlying economic problem.
Think of an idle trailer as inventory with wheels. Its cost is not limited to whatever a carrier may charge after free time expires. A delayed arrival at a dock may cause a receiving crew to idle; a late departure can interfere with the next load; and a switcher traveling across the yard to correct a location error cannot complete another productive move. None of these effects can be assumed to occur on every delayed load, and care is needed to avoid double-counting. The point is to measure the complete operating consequence rather than one convenient invoice line.
A useful distinction is between time spent waiting for resources and time spent executing the work. The first may be recoverable through better coordination; the second may be constrained by physical throughput. Before adding doors, trailers, or personnel, managers should know which constraint they are actually paying to overcome.
Kimberly-Clark changes the economics of the exception
At one Kimberly-Clark site, the financial stakes were unusually clear. A June 2026 FourKites customer case study reported roughly $868,000 in monthly detention charges, with 35% of trailers entering detention. Following deployment of Dynamic Yard monitoring and exception alerts, the company reported a 52% reduction in detention fees within 30 days, or approximately $448,000 in first-month savings. The share of trailers entering detention fell to 20%.
These are supplier-published customer results, not independently audited numbers, and they describe a single location rather than Kimberly-Clark’s entire network. Even with those qualifications, the operational mechanism is instructive. Shipping coordinators were given earlier warning about trailers nearing detention thresholds. Instead of discovering a financial problem after it appeared on an invoice, they could prioritize an actionable move before the expense accumulated.
The difference is between visibility as observation and visibility as execution. Knowing that a trailer is in spot 37 is useful information. Knowing that the trailer will incur a charge shortly, identifying the department responsible for releasing it, and putting that movement ahead of lower-value tasks creates an operating result. The value does not come from a more attractive screen; it comes from a decision made in time to matter.
From radio calls to a shared operating picture
Volvo Group offers a related example. In an October 2026 FourKites case study, the manufacturer described replacing radio-based switcher coordination with on-screen trailer visibility. It reported that detention costs fell from approximately $54,000 to $26,000, or roughly half. Appointment scheduling was still being managed in spreadsheets, with a December deployment of Appointment Manager planned at the time of the announcement.
That sequence matters. Volvo did not need every component of its yard operating model to be transformed simultaneously before it could improve results. It attacked an immediate coordination problem, then planned to extend the same operating discipline to arrival scheduling. The limiting factor was not only a shortage of assets, but the absence of shared, current information about which assets were available and where they were needed.
Kaleris reports another version of this story at East Coast Warehouse and Distribution. Its yard-management deployment, including RFID asset tracking and tighter WMS/TMS integration, was associated with a 19% productivity increase and a 30% reduction in operating expenses. The business reduced its active switcher fleet from ten units to seven. Those numbers are specific to that operation; they are not a general promise that every yard can remove 30% of its equipment. They demonstrate the value of examining whether poor sequencing is masquerading as a capacity shortage.
Penske Logistics approached the same boundary from the gate. At its Shippensburg, Pennsylvania, site, Blue Yonder and Panasonic Edge helped automate the identification and timestamping of arriving and departing trailers and connect that information to warehouse processes. Penske reported improved gate throughput and fewer manual errors, but the published case does not quantify a detention reduction. That is an important difference between an observed operational gain and a savings claim that still needs measurement.
At the other end of the spectrum, automation can perform the movement itself. An Outrider deployment at Georgia-Pacific passed 1,000 autonomous trailer moves in a production yard in 2021. Autonomous yard execution and digital yard coordination solve different problems, but both depend on the same prerequisite: the right task must be identified, authorized, and completed in the right sequence.
Put the yard on an operating scorecard
The most revealing measure is not how many trailers a facility can hold; it is how much productive movement the facility obtains from the trailers, doors, and employees it already has. An effective scorecard would connect arrival-to-gate time, gate-to-door time, door occupancy, unload/load duration, dwell after work completion, and departure performance. It would separate carrier lateness, insufficient labor, unavailable inventory, equipment faults, and coordination failures rather than assigning every delay to the yard team.
The same discipline should govern savings calculations. If a company claims to reduce detention by $200,000, finance should reconcile that figure to actual charges and contract terms. Any additional labor or equipment benefit needs its own before-and-after evidence. Technology should also be evaluated on the safety and reliability of the resulting work—not simply the speed at which moves are issued.
For years, the yard was treated as the space between transportation and warehousing. In financial terms, it is part of both. The companies recovering its hidden costs are not necessarily the ones with the most trailers, the largest buildings, or the most sophisticated dashboards. They are the ones able to turn a known exception into a timely operational action. The idle trailer is where an enormous amount of logistics efficiency either survives or disappears.
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