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Diverging Diamond Interchange Design

The Diverging Diamond Interchange (DDI) is an innovative new concept that is hailed by Popular Science magazine as one of the top innovations of 2009. The design features a traffic signal that moves both directions of traffic to the opposite side of the road before crossing the freeway. That permits drivers to make left turns onto the highway without stopping at another red light.

TranSystems is designing one of the first DDI in the United States at the intersection of I-70 and Woods Chapel Road in Blue Springs, Mo.

Benefits of DDIs


Increased capacity over typical diamond.
Interchange using same structure size, eliminates left-turn phase.
Cost savings due to structure re-use of smaller structure size.
Improved safety by removing left-turn conflicts.

DDIs provide the greatest benefit at locations where:

There are heavy turn movements to/from the highway with lower cross street through movements.
There are limitations on the existing structure size (cross-road over) or column spacing (cross-road under).
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