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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

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Presentation Transcript
slide1
SDDIs:

How a Complete Misunderstanding Splintered a Diamond

Jeremy Jackson

Scott Johnson

Smith Siromaskul

typical ddi layout university parkway
Typical DDI Layout- University Parkway
  • Median pedestrian treatment
  • Pavement slope concerns
  • Uncertainty of future volumes

University Parkway

N

differences
Differences
  • Existing (2012 counts)
  • Design Year (2034)
choosing a design
Choosing a design
  • Need for excess capacity, within reason
  • Mitigation for pavement sloping issues
  • DDI Variants
advanced left ddi seclin france
Advanced Left DDI – Seclin, France
  • Three structures
  • Three roadways (2 EB, 1 WB)
finding flaws in a diamond
Finding flaws in a diamond

Delay in seconds per vehicle through the entire interchange area

summary
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
contact information
Contact Information

Smith Siromaskul, P.E.

1001 SW 5th Avenue #1800

Portland, OR 97204

smith.siromaskul@hdrinc.com

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