Intersection
This is the intersection I've designed for my new storage system. Main purpose is to have 2 belts IN and 2 belts OUT for each basic raw resource (iron, copper, coal, stone) or 16 belts in total.This intersection is where all 8 OUT belts are merging into main belt highway, while 8 IN belts continue further unobstructed. Each belt is split into slower belts in order to make most efficient turn, and then merged back into faster belt. As a result each belt can send resources at maximum capacity possible in vanilla game.
Colour coded version
This is colour coded version for help understanding the flow.