Why manual route planning breaks past 50 stops a day

A planner working from memory and a spreadsheet can hold maybe 20-30 delivery stops in their head at once: which truck has room, which store closes early, which area to avoid at rush hour. Below that ceiling, manual planning is fast and cheap. Above it, something has to give.

What usually gives first isn't obvious from the outside: routes still get built, drivers still leave the depot, deliveries still mostly happen. What erodes is the margin. A truck goes out at 70% capacity because nobody had time to check if a fourth stop would fit, or a store misses its time window because the planner front-loaded the easy stops first. None of it shows up as a single dramatic failure. It shows up as a slow tax on every day's fuel bill and every week's on-time rate.

The fix is to take the constraint-checking off a human's mental load entirely. Capacity, time windows and distance limits are exactly the kind of thing software should check exhaustively, on every stop, every time, so a planner's judgment gets spent on the calls that actually need a human: which store gets the apology call, which driver knows a shortcut the map doesn't.