One thought that occurred to me is that drivers might unconsciously not want to delay deliveries for later in the day if they can be done sooner. Delivery loca

One thought that occurred to me is that drivers might unconsciously not want to delay deliveries for later in the day if they can be done sooner. Delivery locations further away will always be delivered later, but if I'm in the neighborhood early in the day I should make those deliveries first. Imagine an optimal route that involves taking an expressway to a remote location and then making deliveries on a local road heading back to the depot and compare that with the reverse trip making deliveries on the local road before returning empty via the expressway. Both trips might seem to be equivalent from an optimization standpoint, but the deliveries would be made sooner on average for the second trip.