One of the things I've enjoyed about my Orks vs Zombies Post Apocalyptic Gorkamorka games is the opportunity to use different types of terrain.
Now imagine for a minute that your mob has just salvaged a bunch of humie high tech nonsense onto your truck, having bopped a few zombies along the way. You drive onto an elevated highway on your way back to Ork town only to find a rival mob speeding straight towards you!
Who will be the first to blink?