Projects

I-270/Dorsett Road Diverging Diamond Interchange (DDI)

I-270/Dorsett Road Diverging Diamond Interchange (DDI)

  • First DDI in St. Louis Region
  • VISSIM Alternatives Analysis
  • Extensive Public Involvement
  • Developed and Implemented Signal Timing

CBB provided traffic engineering and planning assistance to the Missouri Department of Transportation (MoDOT) for the design and implementation of the I-270/Dorsett Road Diverging Diamond Interchange (DDI) constructed in 2010.

Prior to MoDOT selecting the DDI as the preferred concept, CBB evaluated a range of alternate configurations including modified diamonds, partial clover-leafs, roundabouts, and single-point urban diamonds. Based on CBB’s analysis and several engineering factors MoDOT and its project partners ultimately selected a DDI for construction.

During the construction phase CBB developed and implemented the unique signal timing required to ensure safe and protected pedestrian accommodations.  Since opening, the interchange operates with far less delay, and traffic queues no longer back onto I-270 during the peak periods.

Projects

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CBB 
12400 Olive Boulevard, Suite 430
St. Louis, MO 63141
314-878-6644
314-878-5876 (fax)