I sort of do this . I build the majority of my infrastructure , including small suburbs and the main roads and highway systems of my metropolitan area . I plan out my subway system and main rail corridors . I handdetail all of my custom parks and the like . Then I only zone a small area to start , to help with the problems like people have already mentioned . Once that ' s built up , naturally progress outwards . I think the main issue with zoning everything at once is obviously the traffic , but also the education and need levels . Furthermore , that can make you really lazy as far as detailing goes . I find that unless I detail things as I build up one area it hardly ever gets done . <| sep |> PPR Robert Kelley vs DAL or Tyrell Williams vs HOU