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Your letter is not hand-carried across town. Both USPS and Canada Post run hub-and-spoke systems: every piece of mail travels to a regional processing plant, gets sorted by machine, and rides back out on the next delivery loop. One plant serves a whole metro area, so a letter to your neighbor passes through the same hub.
When you drop a letter in a collection box, it does not go straight to the address on the envelope. The box is emptied into a truck, and that truck drives to a regional processing plant, often quite far from where you posted it. At the plant, machines read the address, spray a routing barcode on the envelope, and sort it into bins organized by destination. Sorted mail is trucked back out to local delivery units before the morning routes go out. Your letter to the next street over makes the same round trip as one headed across the country. The only difference is which bin it lands in.
The sorting itself mostly happens overnight. Plants run evening and night shifts so mail collected during the day is ready for carriers the next morning. That overnight rhythm is why a same-city letter can still arrive in a couple of days even after a long detour: the truck ride is short compared with the wait between collections.
It sounds wasteful to drive a letter 60 kilometers to a plant and 60 back, but hand-carrying would be far more expensive. A carrier's route is a one-directional delivery sequence, not a taxi service: carriers are not set up to collect a letter at one stop and hand it to another house three streets away. Collection boxes are emptied on their own schedule by separate trucks.
Scale is the other reason. One plant's machines sort tens of thousands of pieces per hour, around the clock, with a small crew. Replacing that with neighborhood-level hand sorting would mean staffing every post office with sorters working through the night, and the labor cost would dwarf what a stamp brings in. Mixing local mail into the same mechanized stream is cheaper, faster, and less error-prone.
| Approach | Speed for local mail | Cost | Accuracy |
|---|---|---|---|
| Hand-carried by carrier | Could be same-day | Very high: needs dedicated local crews | Human sorting, more mis-sorts |
| Hub-and-spoke plant | Usually a couple of days | Low per piece: shared with all mail | Machine-read, barcode-verified |
That string of thin bars the machine prints along the bottom is an Intelligent Mail barcode in the US, and Canada Post uses its own equivalent. It encodes the delivery point down to the street and house, and it tells the sorting equipment exactly where the piece goes on the second pass. This is the quiet reason the detour works: by the time your letter leaves the plant, a machine has already decided its exact place in a carrier's delivery sequence, whether that carrier works across town or across the country.
Yes. Canada Post runs its mail through plants in major cities, and the same logic applies. A letter mailed in Toronto and addressed in Toronto can easily ride to a plant in Mississauga and back before it reaches its destination. Rural mail takes longer detours still: a letter posted in one small town and addressed to the next town over may travel to the nearest regional plant, which can be hours away by truck. The system is built for the whole network, not for the shortest path of any single letter.
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LetterAgent is a working name. Prices include print, postage, and our service fee. US prices in USD, Canadian prices in CAD (Canadian prices exclude applicable sales tax, added at checkout). Currently in private testing.
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