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


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.


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


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


…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


…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


…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


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


…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


…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


…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


Why are Roundabouts Being Considered?

  • Safest Intersection
  • High Capacity / Low Delay
  • Good for All Modes of Traffic
  • Geometric Flexibility
  • Aesthetics

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.
pedestrians bikes safety summary
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)
a european perspective

A “European” Perspective

Photo: Matthew Enders, WSDOT


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

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


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."

public opinion will change
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.


Roundabout Solutions

Glen & Bay Streets, Glens Falls - 5 leg urban


Roundabout Solutions

The Batavia roundabout in 20 years

The NYSDOTRoundabout Design Unit would like to thank everyone for their attendance this beautiful evening…Questions? Comments?
nysdot roundabout design unit contact information
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: [email protected]