People have been saying it for years, and nobody believed them. You? You didn't necessarily believe them either. But you've always been a better-safe-than-sorry kind of person. Well, look who's laughing now.
You are riding in the Road Train, a massive homemade truck capable of getting you and your crew away from the oncoming apocalypse. Unfortunately, the universe didn't give you quite enough time to prepare, and the Road Train is not fully complete. You'll have to improvise a little bit.
In Roll Out, you control a crew of people simply trying to survive the coming apocalypse. Since the Road Train isn't fully complete, it needs to stop every so often to get more fuel, supplies, and have repairs done.