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General Roundabout Overview

NEW YORK STATE DEPARTMENT OF TRANSPORTATION. General Roundabout Overview. What is a Roundabout? It is a type of intersection control, just as signals and stop signs are examples of intersection control. Example of Signal Controlled Intersection.

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General Roundabout Overview

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  1. NEW YORK STATE DEPARTMENT OF TRANSPORTATION General Roundabout Overview

  2. What is a Roundabout?It is a type of intersection control, just as signals and stopsigns are examples of intersection control.

  3. Example of Signal Controlled Intersection

  4. Roundabouts are circular intersections designed so that: 1. Entering traffic must yield to circulating; 2. Entering vehicles are deflected by splitter islands, creating a low / similar speed environment; 3. Circulating vehicles must travel around a non-mountable center island.

  5. Leading Roundabout States Colorado > 240 Washington > 150 Utah > 110 Maryland > 100 North Carolina > 90 Oregon > 75 Florida > 50 Kansas & Missouri > 45 each California & Nevada > 30 each Arizona >25 New York at least 54, with > 90 in design throughout the state

  6. New York Roundabouts – SingleLaners North Haven (01) single laner that was to be 1 of 2 Rochester (03) single laner on RIT campus Great Neck (03) single laner that replaced signalized circle Voorheesville (03) single laner that replaced yield “Y” Greenwich (04) single laner that replaced signalized “T” Ithaca (04) single laner off state system Plattsburgh (04) single laner that replaced signalized 4-way Liberty (2) (06) single laners off Exit 100, I-86 Cortlandt Manor(06) single laner that replaced signal Huntington (02) single laner used for traffic calming Rochester (05) single laner with raised pedestrian crossing

  7. …New York Roundabouts – Single Laners Mt Vernon (06) single laner with fountain and music Mendon (06) single laner with center light; hi-speed Stony Brook, LI(06) single laner on campus roadway Poughkeepsie (3)(06/08) single laners near Vassar College Bethlehem (07) single laner that replaced a 3-way stop Bainbridge (07) single laner just off I-88 exit w/NY 206 Hamburg (4) (07/08) urban single laners made of 100% PCC Westchester Airport (06) access to local airport Westhampton Beach (06) oval single laner at former 6 corners Eastern LI (07) local intersection designed by McLean Colonie Center (07) access to mall from town road Glens Falls (07) 5 legs in urban, downtown environment

  8. …New York Roundabouts – Single Laners Malta (08) single laner for Round Lake Bypass Cohoes (08) single laner at 3 corners Niagara Falls (07) single laner on Rainbow Boulevard Malta (2) (08) single laners on Dunning St. for Tech Parks Buffalo (2) (08) single laners that are only 100’ apart Caledonia (05) resigned & restriped traffic circle

  9. …New York Roundabouts – Major/Minors Kinderhook (05) 2 laner for SB direction only, 5 legs Buffalo (08) Harlem/Cleveland Road Corning (2) (03) access permits for R & D plant Latham (02) resigned & restriped traffic circle Griffiss (02) major-minor done in old air force base

  10. New York Roundabouts – Two Laners Kingston (00) 2 laner that replaced traffic circle Malta (5) (06) 5 total in a ¾ mile corridor Johnson City (05) 2 laner & flyover that replaced traffic circle Slingerlands (4) (07) 4 total in a 1.5 mile section of new hwy

  11. …New York Roundabouts – In Construction Round Lake major-minor @ Rt 9/67 Rotterdam single laner @ 7/146 Batavia single laner @ 33/98 Irondequoit (4) single laners at end of 590 Buffalo major-minor on Outer Harbor project Aurora resigned and restriped single lane circle

  12. …New York Roundabouts – In Final Design Latham Old Wolf @ Old Nisky Malta (2) a single & major-minor for AMD Monticello single laner @ 104 off 17B Mayfield major-minor @ 29 & 30 East Greenbush Route 4 @ 151

  13. …New York Roundabouts – In Design Auburn railroad right thru center island Brockport single laner with ROW constraints Cicero Onondaga County project Glenville Maple @ Glenridge Road

  14. Why are Roundabouts Being Considered? • Safest Intersection • High Capacity / Low Delay • Good for All Modes of Traffic • Geometric Flexibility • Aesthetics

  15. 2004 Safety Data from Maryland DOT • Reduction of Total Crashes by 68% • Reduction of Property Damage Only Crashes by 41% • Reduction of Injury Crashes by 86% • Reduction of Fatal / Incapacitating Crashes by 100% • This resulted in a B/C analysis that indicated for every dollar spent on these projects, considering the 15-year service life of the roundabouts, there is a return of approximately $15.00 to be realized through accident reduction.

  16. Roundabouts Reduce Crashes!!!

  17. Roundabouts Reduce Crossing Conflicts

  18. Roundabouts Make Crossings Safer

  19. NYSDOT Pedestrian Guidance Video

  20. Village of Great Neck, Long Island

  21. High #’s of Peds Cross from LIRR

  22. Unless “All Red” Signals Provide No “Protected” Pedestrian Phase

  23. Crossing at the Signal – Safer?

  24. NYSDOT Bicyclist Guidance Video

  25. Young Bicyclist at Voorheesville Roundabout

  26. Pedestrians / Bikes Safety Summary • Zero SEVERE Injury or Fatal Ped/Bike Crashes at any U.S. High Capacity Multi-Lane or Single-Lane Roundabout • Approximately 13 non-injury since 1993 (8 cyclists, 5 pedestrians)

  27. NYSDOT Single Lane Roundabout Signing

  28. Adding a Signal Doesn’t Always = SafetyThe Leader Herald – April 22nd, 2005

  29. Red Light Running Cameras

  30. A “North American” Perspective

  31. A “European” Perspective Photo: Matthew Enders, WSDOT

  32. Public Involvement • Public resistance is common • Before construction: 3 to 2 against roundabout • Education is crucial • After construction: 4 to 1 in favor of roundabout • Visualizations are very helpful

  33. Common Objections – Snow Removal Greenwich, NY Roundabout

  34. Common Objections – Large Trucks 75’x13’ Modular Home Takes Left at Greenwich, NY Roundabout

  35. Common Objections – School Area Valatie Roundabout Sherrill Phillips, Supervisor of Transportation for the Ichabod Crane School District (28 buses) "Very pleased with the roundabout – there are no problems reported from any of their bus drivers." "Red light running was common before with the signal, especially from Rt 9 South." "Students crossing from the school (south of roundabout) have a safer crossing due to the traffic calming effect."

  36. Public Opinion WILL Change The director of the Charles R. Wood Theater said she was skeptical when the Greenwich roundabout was first talked about. "I'm not an expert on traffic, but I was convinced it wasn't going to work out," she said. Now, she describes driving through the circular intersection as an "awesome“ experience. "I guess sometimes you just have to trust the opinions of traffic experts," she said.

  37. Roundabout Solutions Glen & Bay Streets, Glens Falls - 5 leg urban

  38. Roundabout Solutions The Batavia roundabout in 20 years

  39. The NYSDOTRoundabout Design Unit would like to thank everyone for their attendance this beautiful evening…Questions? Comments?

  40. NYSDOT Roundabout Design UnitContact Information Richard Schell, PE Howard McCulloch, and Tom Kligerman, PE Roundabout Design Unit 50 Wolf Road, POD 24 Albany, New York 12232 Tel: (518) 485-7503 Fax: (518) 457-2916 E-mail: roundabouts@dot.state.ny.us

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