Mysterious Dirt Roads in WDW

For the last several months, I've noticed some dirt roads off to the sides of several main roads (World Drive, Osceola Parkway). There's a 99% chance this is routine, nothing to get worked up about, maybe even something there for ages. But I could swear they weren't there a few years ago.

My best guess is that they provide a path for heavy-duty construction vehicles, so they don't have to travel on the Guest roads (and cause delays). Why they NEED heavy vehicles is another interesting question. Again, it's probably routine. Fixing overpasses and the like. But I did want to report on the dirt roads all the same.