Watching the truck "live" though... makes me wonder who comes up with their routes. Go north, then go back south. Then go back north, and west. Then go east and back south, then north again. There's no rhyme or reason to it at all that I can see.
I actually had to take a math class that dealt with exactly how they establish those routes. I'll try not to make this too boring if you REALLY want to know...
The idea behind how it works is that every point on a line is a correct answer for the equation of that line and every point on that line has its closest distance between themselves ON that line.
So.. To get from: A-B-C-D-E-F-etc, you always go along the "line of the alphabet" to get the shortest distance, right? Well, that's true in 2 dimensions (X and Y, like we all learned in primary school). What happens when another line, with all of its own correct answers, intersects the original line in a different axis (Z). Now you have a set of values that satisfies the equations of both of those lines, at their intersection, to yield only one correct answer for that set. So you've solved 3 variables with 1 uniquely correct answer.
Well... What happens if there are more than 3 axis? Like, say, as many as the number of packages on a delivery truck? All of those packages have to be delivered, so eventually all of those lines have to intersect, but there are billions or trillions of correct solutions for how to do it. Which one is the MOST correct of all of the correct answers?
Airlines and delivery companies spend huge amounts of money trying to solve that equation every single day. Things that aren't at all obvious to us, like analyzing every intersection in America to determine at exactly X time of day there's a Y% of a driver having an accident, or waiting at a red light, or whatever else you can imagine, all factor into their route decisions. It's absolutely mind boggling the level of planning that goes into those routes, as nonsensical as they may seem to us as observers, to account for every second and every gram of gas and every possible avoidance of an accident.
Or your driver was just drunker than hell that day?