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Mainstreaming Roundabouts in the Nutmeg State

Consultant Perspectives and Lessons Learned:. Mainstreaming Roundabouts in the Nutmeg State. Northeastern US Roundabout Peer Exchange 8/19/2008. Joseph C. Balskus, PE, PTOE Director of Traffic and Parking. Presentation Outline. Existing Roundabouts Constructed Roundabouts

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Mainstreaming Roundabouts in the Nutmeg State

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  1. Consultant Perspectives and Lessons Learned: Mainstreaming Roundabouts in the Nutmeg State Northeastern US Roundabout Peer Exchange 8/19/2008 • Joseph C. Balskus, PE, PTOE • Director of Traffic and Parking

  2. Presentation Outline • Existing Roundabouts • Constructed Roundabouts • Planned Roundabouts • Summary

  3. New Haven Roundabout Location I-91 Yale 34 Project Area I-95

  4. New Haven City Map Roadway Map View • Route 34 Expressway • -Was to Extend Westerly • -Abandoned at Garage • -Frontage Road Ramps

  5. Aerial View YALE UNIVERSITY CAMPUS AIR RIGHTS GARAGE ROUTE 34

  6. STREET NORTH FRONTAGE ROAD STREET GARAGE EXIT ROUTE 34 WESTBOUND GARAGE EXIT AIR RIGHTS GARAGE GARAGE ENTRANCE ROUTE 34 EASTBOUND SOUTH FRONTAGE ROAD YORK GARAGE ENTRANCE COLLEGE Traffic Flows AIR RIGHTS GARAGE ROUTE 34

  7. Prior Conditions • Study Area – Between Expressway Ramps • Existing Garage Access • Overpass to East

  8. Prior Conditions • Garage – Over Abandoned Expressway ROW • Existing Concrete Pavement • Access Control for Garage

  9. Project Stakeholders • Yale-New Haven Hospital - Client • City of New Haven - Owner • New Haven Parking Authority – Garage Operator • Connecticut Department of Transportation – ROW Owner • Yale University - Security

  10. Project Requirements • Maintain Access to Air Rights Parking Garage • Provide Direct Access to Route 34 • Both Directions Instead of Just Eastbound • New Connection To Highway (Off Ramp) • Provide Access For Trucks to Loading Dock in Garage • Allow Upper Levels of Garage to Exit to Route 34 • New Internal Ramp Connection

  11. Project Issues • Roundabouts Are Very New to Connecticut! • Expressway Ramp Connection to a Roundabout • High Speed to Low Speed • Access Control System for Parking Garage • Entering Traffic Thru Roundabout Must Stop at Gate • Need Separate Car and Truck Access Control Systems • Jurisdictional Maintenance • ConnDOT, City of New Haven and Parking Authority • Reuse of Abandoned Expressway Pavement • Short Entrance Ramp • Large Truck Access

  12. Design Study Efforts • Review Alternatives • Unsignalized Access • Ramp Access to Upper Levels of Garage • Roundabout Variations • Roundabout – Final Recommendation • Connection to Route 34 with Long Drive/Ramp • Connection to Internal Garage Ramp • Other Ramp Widening Improvements Included • Roundabout Design to Follow NYSDOT Guidelines

  13. Alternatives Studied - Unsignalized

  14. Roundabout with Flyover Ramp

  15. Flyover Ramp

  16. Traffic Volumes – Morning Peak Hour

  17. Traffic Volumes – Afternoon Peak Hour

  18. Selected Alternative • All Directions, Except WB to Frontage Road

  19. Selected Alternative • Expressway Connection – Both Directions

  20. Design Parameters • Single Lane with 14’ Truck Apron • 130’ Maximum Outside Diameter • Left Offset Roundabout Layout • WB-67 Truck Access • Significant Truck Usage • Followed NYSDOT Roundabout Guidelines

  21. Construction Details • Bituminous Concrete Pavement over Underlying Concrete Pavement • Concrete Pavers – Truck Apron w/4” Curbing • Signing – NYSDOT Modified • Dual Chevrons with One Way Arrows • Expressway Guide Signing Included • Internal Garage Ramp Connection

  22. Design Plan

  23. Construction Progress

  24. Construction Progress

  25. Roundabout Experience-Route 34 Roundabout

  26. Reserve Road, Danbury • Local Roadway • Former Union Carbide HQ • New Neighborhood • 2000 housing units • Desired Gateway to Project

  27. Reserve Road, Danbury

  28. Milestone/Reserve Road, Danbury • Collector Roadways • Access to Union Carbide HQ • New Neighborhood • Higher Speed Concerns

  29. Not Yet Constructed Landscape architect design Form over Function Sightlines! Milestone/Reserve Road, Danbury

  30. Exquisite Landscape Elements Sight Line Concerns Milestone/Reserve Road, Danbury

  31. Merritt Parkway Interchange 47 Existing Traffic Circle Awkward Movements NHCRP, RODEL Scheduled for Construction 2010-2011 Park Avenue at Merritt Parkway, Trumbull

  32. Park Avenue at Merritt Parkway, Trumbull

  33. Conducted Preliminary Engineering and Concept Design Developed Unique Hybrid Roundabout Design Design Goals include Reduced Congestion and Improve Safety in college town Field Park, Williamstown, MA

  34. Conducted Preliminary Engineering and Concept Design Developed Unique Hybrid Roundabout Design Design Goals include Reduced Congestion and Improve Safety in college town Field Park, Williamstown, MA

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