i just bought the latest street and bus map for beijing. In addition to being surprisingly useful and up to date for a beijing publication, there is documentation of the most insane highway interchanges I've ever seen. I have negotiated these from the ground, and trust me, they are a total f*#king mess, but from above they are insane, yet beautiful. it's as if the civil engineer had "heard" there were such things as cloverleaf interchanges in the world and then reversed engineered it in the form of a chinese knot.
see the maps
This field guide to highway interchanges only barely explains what is going on in these images