Zone Ratings are the official state of a given area. They were created in 1969 by an English college professor, named Warren Pike. There are 8 categories of Zone Ratings, rated in danger by the darkness of the colour the area is given: White Zones: The safest areas in an undead outbreak. There are almost no infected in these areas, and thus, they are very ideal for evacuation zones. They are very prone to overcrowding, and being downgraded to other colours, as many infected refugees flee to the nearest White Zone.