United States Department of Transportation
i
Missouri's experience with a diverging diamond interchange : lessons learned.
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2010-05-01
[PDF-24.07 MB]
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Alternative Title:DDI lessons learned
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Edition:Fianl.
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Abstract: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 nation’s first Diverging Diamond Interchange (DDI). MoDOT’s Engineering Policy Guide
(EPG) will be updated to reflect current practices as institutional knowledge and experience increases.
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