FHWA Roads & Bridges
ArticleA diverging diamond
interchange (DDI), born in the City of Lights in the mid-1970s, is currently
under construction in Kansas City at the intersection off I-435 and Front
Street. When completed, it will be the first interchange of its kind in the U.S.
As new approaches are explored to ease traffic congestion, innovative designs
like this will become more abundant.
FHWA Roads and
Bridges.pdfDDI Sample Layouts
DDI Example
Layouts.zipFHWA DDI Performance
ResearchTransportation planners and traffic
engineers are facing the challenge of inventing ways to mitigate congestion
during peak hours. Alleviating delays and improving safety for passengers and
pedestrians is the primary motive. On way of achieving this objective is to
search for alternative intersection and interchange designs.
FHWA DDI Performance
Research.pdfMissouri DOT DDI Driving
VideoView a simulation video of the
diverging diamond interchange.
Missouri DOT DDI Driving
VideoFHWA Tech BriefIn recent years, the FHWA has been advocating novel
intersection designs as a way to promote intersection safety while meeting the
often conflicting demands for increasing capacity, decreasing congestion, and
minimizing the cost of new infrastructure. On of these novels designs is the
diverging diamond interchange.
FHWA Tech Brief