alternate bus route?

[A11 L1V3S L0ST]

I just casually sat down after a long day and started up a game of zombies on tranzit, and once the screen loads, first thing I see, isn't zombies idling around to be knifed, but instead the bus driving BEHIND the bus depot, turning around where the nav card can be found and then around to the front. I have always thought that you should be able to get behind the bus depot, and what if this simple thing we never saw was actually proof that there is a second bus route and more to the map then we've explored? Any thoughts?

[Caddyman]

everyone sees that every game, i guess you never noticed it?

[A11 L1V3S L0ST]

No, I've always thought you should be able to get back there, and I have seen skid marks behind the bus depot but I've never seen the bus behind there.