Obligatory: http://en.wikipedia.org/wiki/Diverging_diamond_interchange http://en.wikipedia.org/wiki/Diverging_diamond_interchange Makes it easier to understan

Obligatory: http://en.wikipedia.org/wiki/Diverging_diamond_interchange http://en.wikipedia.org/wiki/Diverging_diamond_interchange Makes it easier to understand, seeing it from above. I also suspect I have seen this on an infrastructure blog which I can't recall offhand. Instant edit: Could the submitted title be made clearer?