If you explain "This is to prevent a u-turn via the right-turn" and "Yan Ching St can u-turn inside the "square box" on Heung Sze Wui Rd", and even better realize "the Y-shape is inside the intersection", there won't be such a long debate from  "must always be correct" and "very intuitive and trivial". I can only realize what's happening here from myself. Ok you explained your view on the software, but we are talking past each other. 
