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Quad-Roundabout Double-Diamond Interchange

Quad-Roundabout Double-Diamond Interchange. ITS World Congress 2011 Joel K. Marcuson, PE Ulteig Engineering Fargo, ND, USA. Background. Concept Developed for Design/Build I-494/TH 169 Project Minneapolis, MN, USA . 3 Traffic Signals Create 3mile Backup Every Morning on TH 169

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Quad-Roundabout Double-Diamond Interchange

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  1. Quad-RoundaboutDouble-Diamond Interchange ITS World Congress 2011 Joel K. Marcuson, PE Ulteig Engineering Fargo, ND, USA

  2. Background Concept Developed for Design/Build I-494/TH 169 Project Minneapolis, MN, USA

  3. 3 Traffic Signals Create 3mile Backup Every Morning on TH 169 Only Signals on TH 169 Corridor Project Need

  4. Remove 3 Signals and Old-Fashioned Cloverleaf/Signalized Intersection Design Replace with Direct Interchange, Bridges/Roundabouts – Local Traffic 6 Roundabouts = MOT Opportunity Project Description

  5. Keep Through Traffic on I-494 and TH169 Moving Maintain Access to Local Traffic Around and Through Project MOT Objective

  6. Remove Signals Quickly Build Bridges Quickly Run Turning/Local Traffic on Roundabout System MOT Approach

  7. Existing Conditions - Current

  8. Proposed Plan - Ultimate

  9. MOT Plan – Full Access (Interim)

  10. Using Permanent Features (Roundabouts) for New Purpose Accommodates all Traffic and Movements Innovation

  11. Innovation Description

  12. Full Access, Improved Traffic Early TH 169 Free Flow I-494 Bottleneck Removed Avg Speeds Doubled Unconstrained Flow – During Construction Benefits of Innovation

  13. Benefits of Innovation

  14. Current Need - > Service < System Interchange Quad-Roundabout DD Interchange Fills That Need Results of Innovation

  15. Flooding – Closed All Nearby Crossings Except TH 169 Volumes Increased on TH 169 Restripe 169, Remove Signals Nature Interfered

  16. $5B Deficit Government Shutdown Contractor Stopped Politics Interfered

  17. Contractor Lost Time, Twice Lost Money, Twice New Approach – Build Final Quickly Quad Roundabout DD Abandoned Result

  18. One of Best Designs Never Implemented An Approach That Will Work For Right Occasion/ Right Time Quad-Roundabout DD Interchange

  19. Are Everything Still Want to Share Idea Could be Groundbreaking Timing/Circumstances

  20. Between Service and System High-Performance Service Interchange Significant Cost Savings Signficant Benefits New Category Needed

  21. System Costs = $250-500M High-Performance = $25-50M Similar Results, 10% of Cost $$ Impacts Important

  22. Couldn’t Make it “Not” Work Doubled Traffic – No AppreciableChange in Performance What We Discovered

  23. Questions?

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