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Diverging Partial Cloverleaf

A DPCI is a very high-capacity, high-speed interchange, with no movement conflicts. Left turns are eliminated, as is any weaving. Like the DWI, all traffic exits each freeway before any enters. The DPCI also requires very little room for right-of-way (that is, it has a very small footprint) in two quadrants, just like the Partial Cloverleaf.

Another advantage is that the ramps and exit lanes, as well as most of the FLUPs pieces (not the FLUPs ramps), can accommodate other transit passing over or under them, such as HSR, monorail, rail, roads and el-rail/tram lines, as most of the ramps are on the ground.

That said, it can get a wee bit complicated to build, mostly because traffic is going in opposite directions than usual in parts. Care must be taken to make sure you place everything correctly; I've made the mistake of putting FLUPs ramps or on-ramps backwards because of the confusion. I suggest copying the above diagram, or better yet, plotting the interchange on a piece of paper; that way you'll have something to refer to if you get lost, and you'll have a better understanding of how this thing works.

Also, due to the incredible pain it is to conceive, let alone construct a grade-separated diversion of RHW4 highways using elevated pieces, all through traffic and left movements from the RHW4 must pass through a few tiles of FLUPs One-Way-Road (OWR). Only three, at the bare minimum not including ramps (eleven including ramps) but it's still a bottleneck (no worse than an OWR tunnel though). Right movements are completely free-flowing. This guide uses extra FLUPs pieces to achieve a cleaner, as slightly more realistic look. (Though in reality, a diverging interchange would more likely use flyovers than tunnel underneath itself to achieve grade-separated diversions. Oh well.)

Exceedingly small footprint, high capacity, and ease of upgrade make this one of the most efficient interchange designs in CS.

Info provided by: http://sc4devotion.com/forums/index.php?topic=14074.0