I'm not sure since i'm a cover driver but there were other deliveries very close to those. obviously it's an in-town route.
That answered my question before I got a chance to ask it.
Multiple packages per stop is the single most driving factor.
The next is stop density.
The basic concept is to reduce the "Cost per stop" and when there are other stops close, that drives down the cost per stop.
The thing I find the most interesting is that people have been bitching about Surepost and now that they are added back to teh UPS driver, people are belly-aching about that.
I swear!