How is stop density calculated for local delivery, and how do you determine if a driver's route is overloaded?

When planning local delivery routes, relying solely on the total number of packages can easily lead to misjudgment. 20 stops on the same street are completely different from 20 stops spread across three cities in terms of driver workload. We used to assign routes based only on package count, and as a result, one specific route was returning to the warehouse late every day. I later started using…