SW Johnson County Interchange

Diverging Diamond Interchange (DDI)

Diverging Diamond Interchange

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The new I-35 at Homestead Lane Interchange will be a diverging diamond style interchange. A diverging diamond interchange (DDI) is a unique form of diamond interchange in which the two directions of traffic, on the non-interstate roadway, cross to the opposite side of the road at each ramp intersection (see figure above). Drivers approaching the first ramp intersection can either turn right or proceed through the intersection by crossing to the opposite side of the road from which they are accustomed to. At the next intersection, drivers are free to make an unopposed left turn or they may choose to continue through the intersection and cross back to the right side of the road. The DDI allows for a two-phase traffic signal operation at the ramp intersections and significantly improves safety since left turn movements do not conflict with opposing through movements.

KDOT selected the DDI configuration as the solution for the volume and type of traffic that will be managed now and into the future at this new interchange location. The reasons for selecting this new and innovative solution are safety, managed traffic flow, and providing better access to I-35.

Click on the image below to view a video simulation as to how you will navigate through the new interchange.

Video Simulation

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Kansas Department of Transportation

Date last revised: November 19, 2010