3 ms·

Not all, but for 1%

• robocat 4y ago
  Ha ha, obviously! I meant all sorting depots, not all mail. Presumably each depot has manual systems, but those systems will be very inefficient and cause backlogs and other subsequent problems. A manual system for a large depot that suddenly gets 20x or more overloaded would struggle with an extended outage of that one centralised system. Finely tuned flow systems often break down spectacularly with unexpected disturbances: look at the problems at container ports. Or play factorio.