SDDIs:
Download
1 / 20

SDDIs: How a Complete Misunderstanding Splintered a Diamond Jeremy Jackson Scott Johnson - PowerPoint PPT Presentation


  • 107 Views
  • Uploaded on

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

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' SDDIs: How a Complete Misunderstanding Splintered a Diamond Jeremy Jackson Scott Johnson' - niesha


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

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

[email protected]


ad