On a recent errand, I was reminded of another wonderful Bangkok "intersection" between Ratchaphruek and Nakhon-In. I use the word "intersection" loosely, since these two roads don't actually touch directly.
This actually is a cool intersection to drive through, assuming that you are only planning to go straight through, especially driving straight on Ratchaphruek through the <hint>underpass</hint>.
Here is a link to the location on Google Maps: intersection2. If you want to answer my questions about the intersection (what does the graph look like, how many transitions are possible, etc), you probably need to go to the interactive map. Frankly, I'm not even sure I included all of the relevant pieces in the picture above. This is one of the charming features of intersections here: sometimes, you have to prepare well in advance of clear signage and may find that you've gotten stuck and can't cleanly make the desired transition.