First operational DDI in the U.S. at I-44 and Route 13 interchange in Missouri.





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Uploaded on Aug 10, 2010

This video is of the first operational DDI in the U.S. at the I-44 and Route 13 interchange in Missouri. HDR compiled the video as part of a DDI evaluation study conducted on behalf of the Missouri Department of Transportation.

Across the U.S., travel demand is steadily increasing, putting additional strain on the existing roadway infrastructure. The need to provide additional capacity is constantly at odds with potential impacts that transportation improvements have on existing developments. The Diverging Diamond Interchange (DDI), also known as a Double Crossover Diamond, is being pursued as an alternative that may provide the extra capacity needed while also significantly reducing the amount of space required for implementation.

This DDI concept is based on a standard diamond interchange with the key difference being a shift in the crossroad traffic in the interchange. Traffic on the crossroad crosses paths twice as traffic is shifted to the left side of oncoming traffic, allowing left turn movements to occur without impeding oncoming traffic. The DDI appears to greatly improve operations along the crossroad and at the ramp terminals.



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