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Innovative Quad-Roundabout Double-Diamond Interchange Design at I-494/TH 169

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This paper outlines a groundbreaking design concept for a Quad-Roundabout Double-Diamond Interchange aimed at reducing traffic congestion on TH 169 near Minneapolis, MN. By eliminating three traffic signals that create a daily 3-mile backup, the design proposes replacing them with efficient roundabouts and bridges to enhance traffic flow. The innovative approach maintains access for local traffic while significantly improving average speeds during peak hours. The design demonstrates substantial cost savings and addresses current bottlenecks effectively, showcasing the potential for future implementation.

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Innovative Quad-Roundabout Double-Diamond Interchange Design at I-494/TH 169

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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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