With apologies to my my malignantly compact 12 lane main bus, which I will not spend the effort to space out on account of my 25 hours Space Exploration save still being a "starter base".
It's fine. The time you spend messing with the spaghetti you save in running back and forth along a strictly one sided bus. But i prefer to keep a pattern of eg 4 belt 2 spaces 4 belt so I can cross it with yellow undergrounds.