Port congestion explained

Port congestion is when a port has more vessels and containers than it can process smoothly, so ships wait offshore for a berth and containers take longer to unload and release. It pushes back your estimated time of arrival (ETA) and can tighten the free time you have to collect cargo. You can watch congestion on your route in the portal's Port Congestion view and plan buffers accordingly.

A port has finite berths, cranes, yard space, and trucking capacity. When arrivals and cargo volumes outrun that capacity, a queue forms. Common triggers include:

• Demand surges — for example, the rush before Chinese New Year or during peak shipping season.

• Labor and equipment shortages at the terminal or in trucking.

• Weather and disruptions that halt operations and create a backlog when they lift.

• Knock-on effects from other congested ports, blank sailings, and rolled cargo.

A useful signal is dwell time — how long containers sit at the port before moving on. Rising dwell times are an early sign that a port is backing up.

• Later arrival. Vessels wait for a berth, so your ETA slips even after the ship has "arrived."

• Slower release. Once docked, unloading and moving containers to the yard takes longer, delaying pickup.

• Tighter free time. Congestion makes trucking appointments and pickup slots scarce, which raises the risk of demurrage and detention charges.

• More rolled cargo. Congestion and full vessels often go together, increasing the chance cargo is bumped to a later sailing. See Rolled cargo explained.

The portal's Analytics section includes a Port Congestion view showing how backed up key ports are. If a port on your lane shows rising dwell times, treat it as a signal to plan extra buffer and line up pickup early. For a walkthrough, see Use Analytics and Market Intelligence.

We factor congestion into how we route and schedule your cargo, and we monitor the ports on your lanes so a backlog doesn't catch you by surprise. The Port Congestion view puts the same picture in your hands, and your ETA in Track your shipments reflects the latest carrier updates. When congestion threatens a deadline, reach out and we'll advise on options.

• What to do if your shipment is delayed

• Use Analytics and Market Intelligence

• Demurrage and detention

• Rolled cargo explained