@Russ , thanks, I understand now. Basically the reason those two paths are at a sharp angle is because they are the same direction, only differnce is that one is at ground level and one is underground.

The question remains, what is the most effective way to map this in OSM? Currently the ground level path is at a slight angle to the underground path. Since OSM rendering is top down, I don't see any way to effectively show the difference between them.