McCaslin Diverging Diamond Interchange

DDI Bridge Concept


DDI ImageA joint project between Louisville and Superior, the Colorado Department of Transportation (CDOT) and the Regional Transportation District (RTD) transformed the McCaslin interchange bridge into what is known as a Diverging Diamond Interchange (DDI). A bold idea, the DDI has significantly reduced congestion problems along McCaslin by eliminating designated left turns. It accomplishes this by temporarily diverting all traffic to the left side of the road through a two-phased signaled interchange. Cars turning left will no longer need to wait for oncoming traffic to stop before proceeding. The project also makes the bridge safer for pedestrian and bicycle traffic by providing a 12-foot-wide path in the center of the bridge. Cyclists also have a designated bike lane.

The project includes RTD-specific off ramps that cross under the McCaslin bridge directly to the McCaslin Park-n-Ride. This addition saves the average RTD bus roughly three minutes per one-way trip. The $12.5 million McCaslin DDI is the first of its kind on the Front Range, keeping our region on the cutting edge of transportation technology. 


DDI Fact Sheet