Great. I was facing same issue and come up with my solution to problem. Even posted design(on a wrong board it seems ). Now I feel silly. For a game being around for so long time it seems there is no problem which is not solved by someone else already .

merged from Gameplay Help -- daniel34 Currently playing my first game of factorio and using main bus concept for my factory. Soon I noticed that one lane of the belt is favored over other as asymmetry arise in production building placement around main bus (most of the buildings were at the bottom)....