>software before the driver took the truck
The UPS route-planning system is called ORION.
>they just follow the GPS
I'd reckon that anyone on a bid route or other route that they are familiar with can do better than what ORION gives us. We aren't taking solely distance into account, that would be far too simple. We're considering other factors too, including hard time constraints like next day air commit times, regularly scheduled pickups, irregular pickups, business hours, and whether we can even physically access the packages [0, 1] that the system wants us to deliver.
>I don't think drivers re-plan their shift.
We most certainly do, we wouldn't finish the day if we blindly followed trace.