Re: The Walking Dead Season 4
Walkers have a herd mentality (if we can call it that) they hear a noise, they all head that direction. At some point they all must have clumped together all following a common noise. The population of the Atlanta Metropolitan Area (where we more or less still are) is over 4-million people. So that's a lot of people to turn and start following noises.
Just because it's futuristic doesn't mean it's practical.