Latest / The Operations Podcast with Fexingo: Process, People, and Profit in Modern Business / How a Container Port Cut Dwell Time by 40 Percent
Transcript
- Lucas: So the Port of Rotterdam is Europe's largest container port. In 2023, the average container sat in the yard for 5.2 days before someone picked it up. By early 2026, that number was down to 3.1 days — a 40 percent cut in dwell time. And they did it without spending billions on new cranes or expanding the terminal. Luna: Forty percent is huge. That's basically the equivalent of adding extra capacity without pouring concrete. What was the main lever? Lucas: It's a combination, but the most interesting piece is the truck appointment system. Most ports operate on a first-come, first-served basis for truckers picking up containers. So you get these chaotic peaks — fifty trucks show up at 8 AM, then nobody from noon to 2 PM. The terminal ends up with idle equipment and frustrated drivers. Rotterdam redesigned the whole thing around a slot-based auction. Lucas: They introduced a system where trucking companies bid for time slots in thirty-minute windows. A slot during the 10 AM to 11 AM window might cost fifteen euros more than a slot at 2 PM. The goal was to flatten the demand curve and match arrival patterns to actual yard capacity. Luna: So instead of policing behavior, they used price signals to smooth out the flow. That's interesting — how did the truckers react? Lucas: Initially, a lot of pushback. The smaller operators felt the big logistics firms could just buy up all the good slots. But the port phased it in over six months, and they also published real-time yard density data — so a trucking dispatcher could see, 'Okay, the deep-sea terminal is at 85 percent utilization right now, maybe I'll take that 2 PM slot instead of waiting in line at noon.' Luna: It sounds like they turned queuing theory into a practical tool. Which is rare — lot of operations research stays stuck in academic papers. Lucas: Right. The port's operations team explicitly used a variant of the Erlang C formula — that's the same math call centers use to predict how many agents they need. They modeled the yard as a multi-server queue with non-stationary arrival rates. And the appointment system essentially shifts arrivals to times when the servers — the cranes and the yard trucks — are underutilized. Lucas: By the way, this is exactly the kind of real-world operations thinking we love to dig into on this show. And we deliberately don't run ads on these episodes. If you want to support that choice, the link is buy me a coffee dot com slash fexingo. No pressure — just a way to keep the conversation ad-free. Luna: Yeah, it's a small thing that makes a big difference. Okay, back to Rotterdam — what was the second lever? Lucas: They redesigned the yard layout itself. Most container terminals stack boxes in a way that makes retrieval unpredictable — you might need a box that's buried under five others, so you have to reshuffle. That's a major source of dwell time. Rotterdam introduced something called 'segmented stacking' — basically grouping containers by expected dwell time. Luna: So if a container is flagged as 'stay less than 48 hours,' it goes into a fast-turn area near the gate? Lucas: Exactly. They use machine learning to predict dwell time based on the vessel schedule, the consignee's historical behavior, even the commodity type. A shipment of perishable fruit has a very different dwell profile than a container of industrial machinery. Those predictions are updated every six hours. And the yard crane operator gets a digital overlay showing which boxes to prioritize. Luna: How accurate were the predictions? I imagine some containers that were supposed to leave quickly ended up sitting for days. Lucas: The port published a paper showing that the model predicted dwell time within one day for about 78 percent of containers. For the misclassified ones, they have a re-optimization cycle every shift. A container that's been sitting longer than predicted gets flagged and moved to a different stack. It's not perfect, but it reduced reshuffling moves by about 35 percent. Lucas: The third lever was a direct financial incentive: a fee on containers that sit beyond 72 hours. Actually, it's structured as a rebate — if you pick up within three days, you get a discount on the terminal handling charge. If you leave it longer, you pay the full rate plus an escalating surcharge. Luna: That's pretty aggressive. In many US ports, free time is often five to seven days. Did the fee cause problems for importers with customs delays? Lucas: That was the biggest pushback. Importers argued that the port was punishing them for things outside their control. But the port's data showed that only about 12 percent of long-dwell containers were actually held up by customs. The rest were just sitting because the consignee had no urgency. So they created an exception process — if you can prove customs or inspection delay, the fee is waived. Lucas: But for the other 88 percent, the fee worked. Within four months, the share of containers staying beyond 72 hours dropped from 34 percent to 19 percent. Luna: That's a big behavioral shift. Did the port see any unintended consequences — like truckers rushing to pick up and causing a different bottleneck? Lucas: They did see a spike in gate congestion at the 72-hour mark. So they had to adjust the appointment system to give more slots in the 48-to-72-hour window. It's a classic systems-thinking issue — you solve one problem and another appears. But over the eighteen-month rollout, the overall dwell time kept trending down. Luna: What about the shipping lines? They're a big part of the equation — they decide which containers go on which vessel, and they often pay for the terminal handling. Lucas: The port worked with the top ten carriers — Maersk, MSC, CMA CGM — to align their operating procedures. For example, they standardized the cutoff times for export containers. Previously, different carriers had different cutoff times, which meant the yard had to segregate boxes by carrier even if they were going on similar vessels. Now, for most deep-sea services, the cutoff is forty-eight hours before vessel arrival. Luna: So the carriers actually cooperate on gate cutoffs? That's rare. Lucas: It took a lot of negotiation. But the port has a unique advantage: Rotterdam is the dominant hub in Northern Europe. If a carrier wants to serve the German hinterland efficiently, they pretty much have to call at Rotterdam. So the port had leverage to say, 'If you want premium slot allocation, you need to comply with these standards.' Not every port can do that. Luna: That's the thing — replicability. The Port of Los Angeles, for example, has tried appointment systems and dwell fees, but they've had mixed results because the power dynamics are different. The shipping lines have more alternatives. Lucas: Exactly. Los Angeles and Long Beach introduced a 'container dwell fee' in 2021, but they kept postponing enforcement because of industry pushback. By mid-2026, they've only collected a fraction of the potential fees. Rotterdam had the institutional credibility and the market position to make it stick. Luna: So the lesson isn't just 'implement an appointment system and a fee.' It's about understanding the specific leverage points in your particular system. Lucas: Right. And that's what makes this case so valuable. The port didn't just copy someone else's playbook. They analyzed their own queue data for six months before making changes. They found that 40 percent of the dwell time was caused by trucks arriving in a four-hour window. So they targeted that. Then they found that 25 percent was due to inefficient yard stacking. They targeted that. The fee addressed another 15 percent. Lucas: Each intervention had a measurable impact. And they used the data from the previous intervention to fine-tune the next one. It's a textbook example of iterative operational improvement. Luna: What's the current dwell time target? Do they think they can get below three days? Lucas: The port's internal goal is 2.5 days by the end of 2027. They think they can get there by tightening the segmented stacking and improving the prediction model. But they've also started experimenting with a 'container pooling' concept — where empty containers are shared among carriers to reduce the number of repositioning moves. Luna: Interesting. So the next frontier is tackling the empties problem. That's a huge cost driver in container shipping. Lucas: Absolutely. The port estimates that about 18 percent of all container moves in the terminal are empty repositioning. If they can reduce that through pooling, it could free up even more yard capacity. But that requires even more cooperation between carriers, which is always the hard part. Luna: It's a good reminder that operations improvement is never a one-and-done project. It's a continuous process of finding the next constraint and easing it. Lucas: Yeah. And Rotterdam's story shows that even a mature, highly efficient operation can find another 40 percent improvement when you dig into the data and align incentives. That's the kind of episode I hope our listeners find useful. Luna: Absolutely. Great case study.