Here is the actual cover art for the first season DVD set of 'The Walking Dead', which, if I recall correctly, was also used as a promotional image.
Seems like an attempt to create an iconic image, but it's one that crumbles into idiocy if you think about it for a second. Let's say there's a zombpocalypse going on, and everyone needs to escape from Atlanta as quickly as possible-
Does it really seem likely that staying on the correct side of the road is going to be a huge priority? Why not use the other side of the road? After all, it's not like there's anyone headed into Atlanta to get in their way.
Also, not for nothing, but how did that train get derailed?
Zombies? Cars swerving off the road, sure, I can get behind that. Zombies are scary, people crash cars over gophers. Not a stretch. But a train? It's on rails. And is heavy. And Zombies, as far as I can tell, are neither of those things.