On airSeason 01EP 0316 min
Five hundred without a routing team
Next-day delivery at national scale is a constraint problem wearing a map.
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Five hundred without a routing team
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Play on YouTubeHow a multi-carrier desk held 500 daily deliveries without hiring a routing function — and why the model was not allowed to invent a route the warehouse could not pick.
The constraint model behind next-day delivery at national scale.
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The map is not the work
Everyone wants a glowing path on a map. The work is cut-off times, bag constraints, and a carrier who will not take a parcel after 16:00 on Thursdays. Encode those first. The path is a rendering.
Don't let the solver lie
A solver that returns an infeasible beautiful route is worse than a clerk with a spreadsheet. We made infeasibility a first-class output: say no, with the constraint that fired.
Exceptions are the product
The 4pm exception is not an edge case. It is Thursday. If your 'AI routing' cannot name the constraint it hit, operations will keep a shadow spreadsheet and you will not know.