Trade · 6 pages · 12 min
How a port is a queue
A port is a line of ships and boxes waiting for pilots, berths, cranes, yards, and gates.
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From the opening
A port processes ships and cargo through a sequence of scarce steps, and each step holds a queue when arrivals exceed its rate. The water outside the breakwater, the berth, the crane, the yard, and the gate are servers in one system, not a single bin that swallows vessels. The opening covers each scarce step holds a line, a full yard stops the cranes, and anchorage is a waiting room.
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Inside
- Each scarce step holds a line
- A full yard stops the cranes
- Anchorage is a waiting room
- The narrowest server sets the wait
- Where the idea stops applying
- A distinction worth keeping
Sources
- Port congestion as queueing
- Berth and yard capacity