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Report a Road Concern | Missouri Department of Transportation

https://www.modot.org/report-road-concern

Report a Road Concern | Missouri Department of Transportation Skip to main content 888 - Ask MoDOT

Report a Road Concern | Missouri Department of Transportation

https://www.modot.org/report-road-concern

Report a Road Concern | Missouri Department of Transportation Skip to main content 888 - Ask MoDOT

Diverging diamond interchange

A diverging diamond interchange (DDI), also called a double crossover diamond interchange (DCD), is a subset of diamond interchange in which the opposing directions of travel on the non-freeway road cross each other on either side of the interchange so that traffic crossing the freeway on the overpass or underpass is operating on the opposite driving side from that which is customary for the jurisdiction. The crossovers may employ one-side overpasses or be at-grade and controlled by traffic lights. The diverging diamond interchange has advantages in both efficiency and safety, and was cited by Popular Science as one of the best engineering innovations of 2009, despite having been sparsely used in its contemporary form in France as early as the 1970s.