The first DDI in the nation opened to traffic on June 21, 2009, in Springfield, Missouri. The interchange in Springfield where the Kansas Expressway (MO-13) passes over I-44 is a huge success. A diverging diamond interchange (DDI), sometimes referred to as a double crossover diamond (DCD), is a diamond interchange that more efficiently facilitates heavy left-turn movements. While the ramp configuration is similar to a traditional diamond interchange, traffic on the cross route moves to the left side of the roadway for the segment between signalized ramp intersections. By moving traffic to the left, left-turning vehicles can enter the limited access highway without the need for a left-turn signal phase at the signalized ramp intersections. Also, left-turning vehicles on the cross route do not conflict with opposing through traffic and may turn without stopping. This report was prepared based upon current knowledge and experience with building and operating the nations first Diverging Diamond Interchange (DDI). MoDOTs Engineering Policy Guide (EPG) will be updated to reflect current practices as institutional knowledge and experience increases.


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    Title :

    Missouri's Experience with a Diverging Diamond Interchange: Lessons Learned


    Publication date :

    2010


    Size :

    142 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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