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Haul Truck Dispatch: Queue-Aware Fleet Assignment (2D)

A queue-driven fleet of mine haul trucks cycles between shovels and a crusher; a swappable dispatch policy decides which shovel each truck heads to next, and the readouts show the effect on throughput and utilization in real time.

Operations Research2DModerate60 FPS📱 Mobile-adapted⇄ 3D version
2d-haul-truck-dispatch ↗ Open standalone

This 2D companion swaps the 3D scene's decorative flow-through animation for a real dispatch loop: each truck drives to a shovel, queues if the shovel is busy, loads a fixed 220-ton payload, drives to the crusher, dumps, and gets re-dispatched — with travel time, load time and projected shovel wait all computed from the controls rather than scripted. Switching the dispatch policy between shortest-projected-wait, nearest-shovel and round-robin shows directly how the assignment rule changes fleet utilization and cycle time.

⚙ Under the hood

Queue-driven mine haul-truck dispatch: trucks cycle between shovels and a crusher on a real state machine (drive → queue → load → drive → dump), with a swappable dispatch policy (shortest projected wait, nearest shovel, round robin) driving throughput and utilization.

haul truck dispatchqueueingmine logisticsfleet utilizationoperations research

2D · HTML5 Canvas 2D · 60 FPS target · runs fully client-side, no install

Why does "Nearest shovel" perform worse than "Shortest projected wait"?

Nearest-shovel dispatch ignores how many trucks are already queued at that shovel, so it keeps sending trucks to the same nearby shovel until its queue grows long, while a farther, empty shovel sits idle. Shortest-projected-wait accounts for both travel time and queue length, spreading trucks across shovels more evenly.

What does "fleet utilization" mean here?

It's the share of total truck-minutes that are not spent waiting in a shovel queue — trucks driving, loading or dumping count as utilized; trucks queued do not. A policy that balances shovel queues better pushes this number up without changing the trucks' top speed.

Why does adding a third shovel change throughput so much?

A third shovel adds loading capacity in parallel, so the fleet spends less total time queued and more time actively hauling — trips completed and tons hauled rise correspondingly, visible directly in the readout panel.

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