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

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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  1. SDDIs: How a Complete Misunderstanding Splintered a Diamond Jeremy Jackson Scott Johnson Smith Siromaskul

  2. Once Upon a Time in Florida

  3. Existing Volumes

  4. Projected Volumes

  5. Typical DDI Layout- University Parkway • Median pedestrian treatment • Pavement slope concerns • Uncertainty of future volumes University Parkway N

  6. Differences • Existing (2012 counts) • Design Year (2034)

  7. What’s Nearby

  8. Choosing a design • Need for excess capacity, within reason • Mitigation for pavement sloping issues • DDI Variants

  9. Colorado Springs, CO

  10. Advanced Left DDI – Seclin, France • Three structures • Three roadways (2 EB, 1 WB)

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

  12. Advanced Left Turn DDI

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

  14. Key Differences

  15. Colorado Springs, CO

  16. Volume Scenarios

  17. Finding flaws in a diamond Delay in seconds per vehicle through the entire interchange area

  18. 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

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

  20. Contact Information Smith Siromaskul, P.E. 1001 SW 5th Avenue #1800 Portland, OR 97204 smith.siromaskul@hdrinc.com

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