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Dye Road and Court Street Roundabout Construction

Dye Road and Court Street Roundabout Construction. John Daly, Manager-Director Fred Peivandi, County Highway Engineer Ken Johnson, Program Development Engineer Genesee County Road Commission. PRESENTATION. Concerns with Dye Rd. & Court St. Intersection What are roundabouts? Fundamentals

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Dye Road and Court Street Roundabout Construction

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  1. Dye Road and Court Street Roundabout Construction John Daly, Manager-Director Fred Peivandi, County Highway Engineer Ken Johnson, Program Development Engineer Genesee County Road Commission Genesee County Road Commission Dye & Court Roundabout

  2. PRESENTATION • Concerns with Dye Rd. & Court St. Intersection • What are roundabouts? Fundamentals • Why a roundabout here? • Project Schedule • Cost Participation Genesee County Road Commission Dye & Court Roundabout

  3. Dye Rd. & Court St. Concerns Genesee County Road Commission Dye & Court Roundabout • A major fatality occurred in 2010 with a driver ignoring the south bound stop sign. • Between 2006-2010 28 minor crashes • Two southbound stop sign violations observed during the peak hour • Traffic Backups during peak hour

  4. What are Roundabouts? Genesee County Road Commission Dye & Court Roundabout A circulating roadway at an intersection which: Is NOT a traffic circle Roundabouts are smaller Low speeds (15-20 MPH) Entering vehicles must always yield to circulating traffic Entrances are angled (deflected) forcing vehicles to slow down Pedestrian crosswalks are before roundabout entrance.

  5. September 17, 2012 Bennett Woods Elementary Bennett Rd. & Hulett Rd Intersection Ingham County Genesee County Road Commission Dye & Court Roundabout

  6. Genesee County Road Commission Dye & Court Roundabout

  7. 1.6.1 Comparison of roundabout categories Exhibit 1-7 summarizes and compares some fundamental design and operational elements for each of the six roundabout categories developed for this guide. The following sections provide a qualitative discussion of each category. Exhibit 1-7. Basic design characteristics for each of the six roundabout categories. 1. Assumes 90-degree entries and no more than four legs. Federal Roundabout Classifications FHWA Informational Guide – RD-00-067 Genesee County Road Commission Dye & Court Roundabout

  8. Brighton Michigan 3rd St. Main St. 66 ft. ROW 55 ft. ROW Genesee County Road Commission Dye & Court Roundabout

  9. Roundabout Safety Persaud et. al. (Insurance Institute for Highway Safety), 2000 (U.S.) of23 U.S. intersections converted from stop/signal to roundabouts it was revealed: * 40% reduction in total crash frequency * 80% reduction in injury crash frequency * 90% reduction in fatal/incap. injury crash frequency Maryland DOT Accident Evaluation, 2004 * ~15:1 benefit – cost ratio for installation of single lane roundabouts • Multi-lane roundabouts see crash rates approach those of signals, but severity is lower • Michigan Department of Transportation • * 76% reduction in severe injuries • * 39% reduction in minor crashes Genesee County Road Commission Dye & Court Roundabout

  10. NCHRP Report 572 – Roundabouts in the US Before-after studies at 55 intersections • 35% overall decrease in crashes • 76% decrease in injury crashes • 81% decrease in fatal/incapacitating crashes for single lane urban roundabouts • 71% decrease in fatal/incapacitating crashes for single lane rural roundabouts • Many other studies with similar results Genesee County Road Commission Dye & Court Roundabout

  11. The Real Benefit .. Genesee County Road Commission Dye & Court Roundabout

  12. RoundaboutCongestion Reduction By definition – Traffic entering a roundabout does not have to stop, but yields when entering More vehicles can occupy the intersection at one time 4 way stop allows only one vehicle at a time Vehicles can enter simultaneously from all approaches compared to two approaches at a signalized intersection Gaps between vehicles can be used by waiting vehicles coming in from all directions Genesee County Road Commission Dye & Court Roundabout

  13. Emissions and Fuel Consumption Reduction Less idling Less Severe Accelerations and Braking Less Fuel consumed Fewer emissions Less pollution Smaller carbon footprint • No electricity compared with signalized intersection Genesee County Road Commission Dye & Court Roundabout

  14. NY State Study Roundabout vs. Signalized intersection Genesee County Road Commission Non-motorized Project Coordination

  15. Why a Roundabout Here? • Road Commission has been impressed with the roundabout crash and congestion reduction statistics. Have looked at other locations • Flint Township has expressed an interest in a roundabout intersection • Dye & Court - locally classified roadway which limits funding. Crash history qualifies for Federal Safety Funds • A roundabout will reduce crashes, delay time, congestion, fuel consumption, emissions and traffic backups Genesee County Road Commission Dye & Court Roundabout

  16. A Roundabout Here pays for itself in 4 years • Due to the crash history a Roundabout will provide $56,711 of crash reduction benefits per year • Most effective crash reduction countermeasures • Crashes • Cost • For an estimated $231,000 construction cost the roundabout will pay for itself in 4 years Genesee County Road Commission Dye & Court Roundabout

  17. Location Dye Rd. Court St. 66 ft. ROW 83 ft. ROW Genesee County Road Commission Dye & Court Roundabout 100 ft. ROW

  18. Roundabout Acceptance BEFORE: 68% Against AFTER 73% For Genesee County Road Commission Dye & Court Roundabout

  19. Project Schedule Road Commission will hold another public meeting Township will take action on a draft agreement Design consultant will be selected Project design this coming winter Project was selected for funding for the 2013 fiscal year Construction in the summer of 2013 w/ Dye Road Genesee County Road Commission Dye & Court Roundabout

  20. Project Cost Participation • Construction Cost Estimated at $231,000 • Federal Aid will contribute 90% or $ 207,900 • Road Commission – Engineering & Inspection $58,000 • Flint Township – Local Match - $23,100 • TOTAL PROJECT COST $289,000 Genesee County Road Commission Dye & Court Roundabout

  21. Additional Project Participation Non-monetary • This is a new traffic control device • Requires public media involvement to education our driving public Genesee County Road Commission Dye & Court Roundabout

  22. In Summary • Dye Rd. & Court St. – crashes, backups • Roundabouts – unique countermeasure - reduces crash injuries & frequency - reduce congestion, fuel consumption and emissions • Roundabout are not just an engineering novelty, • but the most effective traffic control countermeasure which solves the problems at this intersection Genesee County Road Commission Dye & Court Roundabout

  23. Thank you Fred Peivandi, County Highway Engineer Ken Jonson, Program Development EngineerGenesee County Road Commission(810) 767- 4920kjohnson@gcrc.org Genesee County Road Commission Dye & Court Roundabout

  24. Video Simulation • Four Way Stop Operation • Roundabout Operation Genesee County Road Commission Dye & Court Roundabout

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