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SDDIs: How a Complete Misunderstanding Splintered a Diamond Jeremy Jackson Scott Johnson Smith Siromaskul. Once Upon a Time in Florida. Existing Volumes. Projected Volumes. Typical DDI Layout- University Parkway. Median pedestrian treatment Pavement slope concerns

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SDDIs: How a Complete Misunderstanding Splintered a Diamond Jeremy Jackson Scott Johnson

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SDDIs:

How a Complete Misunderstanding Splintered a Diamond

Jeremy Jackson

Scott Johnson

Smith Siromaskul


Once Upon a Time in Florida


Existing Volumes


Projected Volumes


Typical DDI Layout- University Parkway

  • Median pedestrian treatment

  • Pavement slope concerns

  • Uncertainty of future volumes

University Parkway

N


Differences

  • Existing (2012 counts)

  • Design Year (2034)


What’s Nearby


Choosing a design

  • Need for excess capacity, within reason

  • Mitigation for pavement sloping issues

  • DDI Variants


Colorado Springs, CO


Advanced Left DDI – Seclin, France

  • Three structures

  • Three roadways (2 EB, 1 WB)


Advanced Left Turn DDI / I-75 at SR 70 – Sarasota, FL


Advanced Left Turn DDI


Splintered DDI / I-75 at SR 70 – Sarasota, FL


Key Differences


Colorado Springs, CO


Volume Scenarios


Finding flaws in a diamond

Delay in seconds per vehicle through the entire interchange area


Summary

Advanced left DDI

  • Improves core lane utilization

  • Separation of crossroad left queue

  • Splintered DDI

  • Large number of lanes

  • Excessive internal queuing

  • Left turns from ramps

  • Unbalanced lefts


Braided Splintered DDI / I-75 at SR 70 – Sarasota, FL


Contact Information

Smith Siromaskul, P.E.

1001 SW 5th Avenue #1800

Portland, OR 97204

smith.siromaskul@hdrinc.com


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