Admit it, we all love zombies. maybe it's because they don't actually exist, and we don't actually have to worry about navigating a life among the undead. but, imagine for a second an alternate universe where they do exist and they have attacked – creating mayhem throughout the country, knocking down communications towers and taking control of bridges and highways. one could imagine a resourceful zombie coalition making it impossible to travel between major cities, isolating human survivors in small districts around the country with no safe means of reaching other districts. the us would become a collection of small outposts, where cities within a district could be reached from within the district, and district residents would need to be careful about travel even within their district. knowing the shortest path between cities to avoid being attacked would be paramount for survival.