Roundabouts Database

29411 Results

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City, State
County
Country 		Intersection
(Lat, Lng) 		Type
Status 		Control Type / Other Control Type Approaches / Driveways / ICD (m) Functional Class /
LaneType 		Year Completed Comments
Emerald Isle, NC
Carteret Co.
United States 		NC 58 / Mallard Dr. / Emerald Landing Dr.
(34.66104, -77.05268) 		Roundabout
Existing 		All-Way Yield
Unknown 		4 Approaches
0 Driveways
42.2420 		Other (At-Grade)
Multilane (2 Lane, unspecified) 		2018 Developer project. ICD estimated from Google Maps linework.
Wheaton, MD
Montgomery Co.
United States 		Park Vista Dr. / Wintergate Dr. / Longmeade Crossing Dr.
(39.10755, -77.05340) 		Roundabout
Existing 		All-Way Yield
None 		3 Approaches
0 Driveways
30.4800 		Other (At-Grade)
Single-Lane 		2020 Painted splitter islands added 2020.
New Oxford, PA
Adams Co.
United States 		Center Square (Lincoln Way / Hanover St. / Carlilse St.)
(39.86388, -77.05586) 		Other
Existing 		All-Way Yield
None 		4 Approaches
0 Driveways
73.3384 		Other (At-Grade)
Single-Lane 		Converted town square: pedestrian access to central island; parking around circle. ICD estimated from Google Maps linework.
Hampton, PA
Adams Co.
United States 		Carlisle Pike (SR 94) / SR 394 / Stoney Point Rd.
(39.92941, -77.05803) 		Roundabout
Existing 		All-Way Yield
None 		4 Approaches
0 Driveways
0.0000 		Other (At-Grade)
Single-Lane 		2020 https://www.ydr.com/story/news/2020/07/16/traffic-alert-12-road-projects-to-know-about-in-south-central-pennsylvania-penndot-roundabout/5359493002/
Tyendinaga, ON
Hastings
Canada 		CR 10 (Deseronto Rd.) / CR 24 (Belleville Rd.) / CR 1
(44.23557, -77.05927) 		Roundabout
Unknown 		All-Way Yield
None 		4 Approaches
0 Driveways
 Other (At-Grade)
Single-Lane 		2021
Arlington, VA
Arlington Co.
United States 		Memorial Dr. / Arlington Memorial Bridge
(38.88573, -77.06004) 		Rotary
Existing 		Unknown
Unknown 		0 Approaches
0 Driveways
114.3488 		Other (At-Grade)
Unknown 		ICD estimated from Google Maps linework.
Eisenhower East, VA
Alexandria City
United States 		Eisenhower Ave. / Holland Ln
(38.80044, -77.06079) 		Other
Existing 		Unknown
Unknown 		3 Approaches
0 Driveways
0.0000 		Other (At-Grade)
Multilane (2 Lane, unspecified) 		0
Breña, Lima
Province of Lima
Peru 		Plaza de la Bandera
(-12.06746, -77.06112) 		Other
Existing 		Unknown
Unknown 		5 Approaches
0 Driveways
 Other (At-Grade)
Unknown
Alexandria, VA
Alexandria City
United States 		Hickory St. / Kennedy St.
(38.83080, -77.06213) 		Traffic Calming Circle
Existing 		All-Way Yield
None 		4 Approaches
0 Driveways
0.0000 		Other (At-Grade)
Single-lane w/ Traversable Central Island 		2024 Central island is painted only and ringed with mountable dividers. https://www.alexandriava.gov/transportation-planning/project/hickory-street-and-kennedy-street-neighborhood-mini-roundabout
Mount Vernon, VA
Fairfax Co.
United States 		Fort Willard Circle
(38.78275, -77.06601) 		Other
Existing 		Unknown
Unknown 		6 Approaches
0 Driveways
0.0000 		Other (At-Grade)
Unknown
Los Olivos, Lima
Province of Lima
Peru 		Ovalo Naranjal
(-11.97737, -77.06605) 		Other
Unknown 		Unknown
Unknown 		4 Approaches
0 Driveways
 Freeway Ramps (Grade-Separated)
Multilane (3+ Lane)
Lisbon, MD
Howard Co.
United States 		MD 94 / Old Frederick Rd. (Lisbon North)
(39.34810, -77.06930) 		Roundabout
Existing 		All-Way Yield
None 		4 Approaches
0 Driveways
26.7839 		Other (At-Grade)
Single-Lane 		1999 ICD estimated from Google Maps linework.
Alexandria, VA
Alexandria City
United States 		Washington Circle: Circle Hill Rd. / Beverley Dr. / Canyon Dr.
(38.83533, -77.07047) 		Other
Existing 		Other
Unknown 		5 Approaches
0 Driveways
0.0000 		Other (At-Grade)
Single-Lane 		Pedestrian access to central island. No splitter islands. Mix of stop, yield, and uncontrolled entries.
Los Olivos, Lima
Province of Lima
Peru 		Ovalo Infantas
(-11.94556, -77.07104) 		Roundabout
Existing 		All-Way Yield
Unknown 		4 Approaches
0 Driveways
 Freeway Ramps (Grade-Separated)
Multilane (3+ Lane)
Alexandria, VA
Alexandria City
United States 		Beverley Circle: Old Dominion Blvd. / Chalfonte Dr.
(38.83602, -77.07233) 		Other
Existing 		All-Way Stop
Unknown 		3 Approaches
2 Driveways
0.0000 		Other (At-Grade)
Single-Lane 		Parking within circulatory roadway. No splitter islands.
Lisbon, MD
Howard Co.
United States 		MD 94 / MD 144
(39.33700, -77.07360) 		Roundabout
Existing 		All-Way Yield
None 		4 Approaches
0 Driveways
30.4800 		Other (At-Grade)
Single-Lane 		1993 First roundabout in Maryland. Built initially as temporary, made permanent after one month.
Olney, MD
Montgomery Co.
United States 		Martins Dairy Cir. / Old Baltimore Rd.
(39.13345, -77.07382) 		Other
Existing 		All-Way Yield
Unknown 		3 Approaches
0 Driveways
0.0000 		Other (At-Grade)
Single-Lane 		Painted splitter islands.
Olney, MD
Montgomery Co.
United States 		Martins Dairy Cir. / Gooseneck Terrace
(39.13176, -77.07439) 		Other
Existing 		Unknown
Unknown 		3 Approaches
0 Driveways
0.0000 		Other (At-Grade)
Unknown
Talleysville, VA

United States 		New Kent Hwy. / Old Church Rd.
(37.52467, -77.07560) 		Roundabout
Existing 		All-Way Yield
None 		4 Approaches
0 Driveways
37.8885 		Other (At-Grade)
Single-Lane 		2008 Two free flowing right-turn bypass lanes ICD estimated from Google Maps linework.
Washington, DC

United States 		Chevy Chase Circle (Connecticut Ave. NW / Western Ave. NW / Chevy Chase Pkwy. NW / Grafton St.)
(38.96761, -77.07716) 		Rotary
Existing 		All-Way Yield
None 		7 Approaches
0 Driveways
109.7280 		Other (At-Grade)
Multilane (3+ Lane) 		On boundary between DC and Maryland (Western Ave. is the boundary). Pedestrian access to central island.
Lima, Lima
Province of Lima
Peru 		Avenida Universitaria / Vía Expresa Línea Amarilla
(-12.03577, -77.07769) 		Signalized Roundabout/Circle
Existing 		Signal
Unknown 		4 Approaches
0 Driveways
 Other (At-Grade)
Multilane (3+ Lane)
Talleysville, VA

United States 		Emmaus Church Rd. / (unknown)
(37.51449, -77.07822) 		Roundabout
Existing 		All-Way Yield
None 		4 Approaches
0 Driveways
43.5777 		Other (At-Grade)
Multilane (2 Lane, unspecified) 		2008 Right-turn only lanes on all approaches with only one circulating lane. ICD estimated from Google Maps linework.
Washington, DC
N/A Co.
United States 		Tenley Circle (Nebraska Ave. / Wisconsin Ave. / Yuma St.)
(38.94628, -77.07875) 		Signalized Roundabout/Circle
Existing 		Signal
None 		0 Approaches
0 Driveways
73.3809 		Other (At-Grade)
Multilane (2 Lane, unspecified) 		ICD estimated from Google Maps linework.
Olney, MD
Montgomery Co.
United States 		Fox Valley Dr. / Hillcroft Dr.
(39.12441, -77.07962) 		Other
Existing 		Unknown
Unknown 		4 Approaches
0 Driveways
0.0000 		Other (At-Grade)
Unknown 		No splitter islands.
Chevy Chase, MD
Montgomery Co.
United States 		Rosemary Circle [Rosemary St. / Hillcrest Pl. / Stanford St.]
(38.97789, -77.08055) 		Other
Existing 		All-Way Stop
Unknown 		5 Approaches
0 Driveways
0.0000 		Other (At-Grade)
Single-Lane 		Parking along circulatory roadway.
Talleysville, VA

United States 		Emmaus Church Rd. / (unknown)
(37.50685, -77.08140) 		Roundabout
Existing 		All-Way Yield
None 		4 Approaches
0 Driveways
41.6873 		Other (At-Grade)
Multilane (2 Lane, unspecified) 		2008 Right-turn only lanes on all approaches with only one circulating lane. ICD estimated from Google Maps linework.
Washington, DC
N/A Co.
United States 		Ward Circle (Mass. Ave. / Nebraska Ave.)
(38.93792, -77.08590) 		Signalized Roundabout/Circle
Existing 		Signal
None 		0 Approaches
0 Driveways
80.8214 		Other (At-Grade)
Multilane (2 Lane, unspecified) 		ICD estimated from Google Maps linework.
Mount Vernon, VA
Fairfax Co.
United States 		Mount Vernon Memorial Hwy
(38.71132, -77.08612) 		Other
Existing 		Unknown
Unknown 		2 Approaches
0 Driveways
0.0000 		Other (At-Grade)
Unknown 		Parking along circulatory roadway.
San Martín de Porres, Lima
Province of Lima
Peru 		Avenida Naranjal / Avenue Canta Callao
(-11.97372, -77.08786) 		Other
Existing 		Unknown
Unknown 		4 Approaches
0 Driveways
 Other (At-Grade)
Multilane (3+ Lane)
Arlington, VA
Arlington Co.
United States 		36th St. S / S Stafford St.
(38.82894, -77.08800) 		Other
Existing 		All-Way Yield
Unknown 		3 Approaches
0 Driveways
0.0000 		Other (At-Grade)
Single-Lane 		Parking within circulatory roadway.
Arlington, VA
Arlington Co.
United States 		N Danville St. / Franklin Rd. / N Bryan St.
(38.89067, -77.09073) 		Other
Existing 		All-Way Yield
Unknown 		4 Approaches
0 Driveways
0.0000 		Other (At-Grade)
Single-Lane 		Parking in circulatory roadway.
Arlington, VA
Arlington Co.
United States 		Key Blvd. / N Cleveland St.
(38.89253, -77.09099) 		Traffic Calming Circle
Existing 		One-Way/Two-Way Stop
Unknown 		4 Approaches
0 Driveways
0.0000 		Other (At-Grade)
Single-Lane
Olney, MD
Montgomery Co.
United States 		Brightwood Rd. / Winding Oak Dr. / Weston Pl.
(39.16065, -77.09120) 		Other
Existing 		Unknown
Unknown 		4 Approaches
0 Driveways
0.0000 		Other (At-Grade)
Single-Lane 		No splitter islands.
Arlington, VA
Arlington Co.
United States 		Key Blvd. / N Danville St.
(38.89224, -77.09208) 		Traffic Calming Circle
Existing 		All-Way Stop
Unknown 		4 Approaches
0 Driveways
0.0000 		Other (At-Grade)
Single-Lane
Olney, MD
Montgomery Co.
United States 		Wickham Rd. / Broom Dr.
(39.15708, -77.09362) 		Other
Existing 		Unknown
Unknown 		3 Approaches
0 Driveways
0.0000 		Other (At-Grade)
Single-Lane 		No splitter islands.
Arlington, VA
Arlington Co.
United States 		Key Blvd. / N Fillmore St.
(38.89146, -77.09415) 		Traffic Calming Circle
Existing 		One-Way/Two-Way Stop
Unknown 		4 Approaches
0 Driveways
0.0000 		Other (At-Grade)
Single-Lane
Olney, MD
Montgomery Co.
United States 		Wickham Rd. / Olney Mill Rd. / Dunsford Dr.
(39.16071, -77.09596) 		Other
Existing 		Unknown
Unknown 		4 Approaches
0 Driveways
0.0000 		Other (At-Grade)
Single-Lane 		No splitter islands on three legs.
Washington, DC

United States 		Westmoreland Circle (Massachusetts Ave. NW / Dalecarlia Dr. / Western Ave. NW / Butterworth Pl. NW)
(38.94892, -77.10097) 		Rotary
Existing 		All-Way Yield
None 		6 Approaches
0 Driveways
100.5840 		Other (At-Grade)
Multilane (3+ Lane) 		On boundary of DC and Maryland (Western Ave. is the boundary).
New Bern, NC
Craven Co.
United States 		Elizabeth Ave.
(35.12585, -77.10821) 		Other
Existing 		Unknown
Unknown 		2 Approaches
0 Driveways
0.0000 		Other (At-Grade)
Single-Lane
Bethesda, MD
Montgomery Co.
United States 		Boxwood Rd. / Spangler Ave.
(38.94781, -77.10888) 		Other
Existing 		Unknown
Unknown 		3 Approaches
0 Driveways
0.0000 		Other (At-Grade)
Single-Lane 		No splitter islands.
Bethesda, MD
Montgomery Co.
United States 		Tournay Rd. / Spangler Ave.
(38.94811, -77.11053) 		Other
Existing 		Unknown
Unknown 		3 Approaches
0 Driveways
0.0000 		Other (At-Grade)
Single-Lane 		No splitter islands.
Erwin, NY
Steuben Co.
United States 		Robert Dann Dr. / Science Center Rd.
(42.15936, -77.11082) 		Roundabout
Existing 		All-Way Yield
None 		4 Approaches
0 Driveways
53.3400 		Other (At-Grade)
Multilane (2 Lane, 2x1 max) 		2001 Add-lane right-turn bypass lane on west leg.
Derwood, MD
Montgomery Co.
United States 		Heartwood Dr.
(39.13239, -77.11434) 		Other
Existing 		Unknown
Unknown 		2 Approaches
0 Driveways
0.0000 		Other (At-Grade)
Unknown
Corning, NY
Steuben Co.
United States 		Robert Dann Blvd. / Aurene Dr. / Creekside Dr.
(42.16506, -77.11484) 		Roundabout
Existing 		All-Way Yield
None 		4 Approaches
0 Driveways
40.7216 		Other (At-Grade)
Multilane (2 Lane, unspecified) 		2003 Access permits for research and development plant. ICD estimated from Google Maps linework.
Derwood, MD
Montgomery Co.
United States 		Achille Ln. / Heartwood Dr.
(39.12925, -77.11543) 		Other
Existing 		Unknown
Unknown 		3 Approaches
0 Driveways
0.0000 		Other (At-Grade)
Single-Lane 		No splitter islands.
Quinton, VA
New Kent Co.
United States 		SR 249 (New Kent Hwy.) / SR 612 (Tunstall Rd.-Airport Rd.)
(37.53278, -77.11546) 		Roundabout
Existing 		All-Way Yield
None 		4 Approaches
0 Driveways
32.2017 		Other (At-Grade)
Single-Lane 		2017 ICD estimated from Google Maps linework.
Alexandria, VA
Alexandria City
United States 		Cameron Station Blvd. / Brenman Park Dr.
(38.80933, -77.11861) 		Other
Existing 		All-Way Stop
Unknown 		3 Approaches
0 Driveways
0.0000 		Other (At-Grade)
Multilane (2 Lane, 2x2 max) 		Pedestrian access to central island.
La Perla, Constitutional Province of Callao
Constitutional Province of Callao
Peru 		Republic of Venezuela Ave. / Avenida La Marina Ramps
(-12.06525, -77.11925) 		Unknown
Existing 		Unknown
Unknown 		6 Approaches
0 Driveways
 Freeway Ramps (Grade-Separated)
Multilane (3+ Lane)
Bethesda, MD
Montgomery Co.
United States 		Bradmoor Dr. / Roosevelt St.
(38.99427, -77.11925) 		Roundabout
Existing 		All-Way Yield
None 		4 Approaches
0 Driveways
21.3360 		Other (At-Grade)
Single-Lane 		2017 Year Completed estimated (2016-2018).
Derwood, MD
Montgomery Co.
United States 		Coppelia Dr. / Toboggan Ln.
(39.13566, -77.11938) 		Other
Existing 		Unknown
Unknown 		4 Approaches
0 Driveways
0.0000 		Other (At-Grade)
Single-Lane 		No splitter islands.
New Bern, NC
Craven Co.
United States 		W New Bern Pkwy. / Clock Dr.
(35.12991, -77.12486) 		Other
Existing 		Unknown
Unknown 		4 Approaches
0 Driveways
0.0000 		Other (At-Grade)
Unknown 		No splitter islands on side street.
Callao, Constitutional Province of Callao
Constitutional Province of Callao
Peru 		Ovalo Cantolao
(-11.99706, -77.12553) 		Other
Existing 		Unknown
Unknown 		4 Approaches
1 Driveways
 Other (At-Grade)
Multilane (3+ Lane) 		Pedestrian access to central island.
Rose Hill, VA
Fairfax Co.
United States 		Park Terrace / Edgewood Dr.
(38.78241, -77.12587) 		Other
Existing 		Unknown
Unknown 		4 Approaches
4 Driveways
0.0000 		Other (At-Grade)
Single-Lane
Callao, Constitutional Province of Callao
Constitutional Province of Callao
Peru 		Ovalo Centenario
(-12.05075, -77.12598) 		Other
Existing 		Unknown
Unknown 		4 Approaches
0 Driveways
 Other (At-Grade)
Unknown
Gaithersburg, MD
Montgomery Co.
United States 		Hoover Farm Dr. / Brass Bucket Ct.
(39.17775, -77.13018) 		Other
Existing 		Unknown
Unknown 		3 Approaches
0 Driveways
0.0000 		Other (At-Grade)
Single-Lane 		No splitter islands.
Gaithersburg, MD
Montgomery Co.
United States 		Hoover Farm Dr. / Holland Meadow Ln.
(39.18129, -77.13125) 		Other
Existing 		Unknown
Unknown 		3 Approaches
0 Driveways
0.0000 		Other (At-Grade)
Single-Lane 		No splitter islands.
(unincorporated), PA
Perry Co.
United States 		SR 34 / Sunnyside Dr. / Mountain Rd.
(40.29453, -77.13262) 		Roundabout
Existing 		All-Way Yield
None 		4 Approaches
0 Driveways
43.7256 		Other (At-Grade)
Single-Lane 		2014 Designed to be expanded to two-lane roundabout. ICD estimated from Google Maps linework.
Callao, Constitutional Province of Callao
Constitutional Province of Callao
Peru 		Plaza Guardia Chalaca
(-12.06804, -77.13347) 		Other
Existing 		Unknown
Unknown 		7 Approaches
0 Driveways
 Other (At-Grade)
Unknown
Callao, Callao
Callao
Peru 		Calle Comandante Juan Fanning [Avenida República de Argentina / Avenida República de Panamá / Avenida Contralmirante Mora]
(-12.05156, -77.13409) 		Other
Existing 		Uncontrolled
None 		4 Approaches
0 Driveways
 Other (At-Grade)
Multilane (3+ Lane)
Callao, Constitutional Province of Callao
Constitutional Province of Callao
Peru 		Plaza Garabaldi
(-12.05221, -77.13904) 		Other
Existing 		Unknown
Unknown 		5 Approaches
0 Driveways
 Other (At-Grade)
Multilane (3+ Lane)
Potomac Heights, MD
Charles Co.
United States 		Cedar Ln. / Glymont Rd. / Greenwood Pl.
(38.60764, -77.14063) 		Other
Existing 		Unknown
Unknown 		4 Approaches
0 Driveways
0.0000 		Other (At-Grade)
Unknown
Cooksville, MD
Howard Co.
United States 		Long Corner Rd. / Penn Shop Rd.
(39.33938, -77.15284) 		Roundabout
Existing 		All-Way Yield
None 		3 Approaches
0 Driveways
28.9560 		Other (At-Grade)
Single-Lane 		2005 Year Completed estimated (1988-2005).
Taneytown, MD
Carroll Co.
United States 		MD 140 / MD 832 / Antrim Blvd.
(39.64809, -77.15468) 		Roundabout
Existing 		All-Way Yield
None 		4 Approaches
0 Driveways
44.1960 		Other (At-Grade)
Single-Lane 		1996 Completed August 1996. Curbs set for double lane, striped for single outer circulating lane.
Potomac, MD
Montgomery Co.
United States 		Old Seven Locks Rd. / Quarry Manor Terrace
(38.99371, -77.16028) 		Other
Existing 		Unknown
Unknown 		3 Approaches
0 Driveways
0.0000 		Other (At-Grade)
Single-Lane 		No splitter islands.
Redland, MD
Montgomery Co.
United States 		Columbus Ave. / Gramercy Blvd.
(39.12362, -77.16494) 		Other
Existing 		All-Way Stop
Unknown 		3 Approaches
0 Driveways
0.0000 		Other (At-Grade)
Single-Lane
Shermans Dale, PA
Perry Co.
United States 		SR 34-SR 850 (Spring Rd.) / SR 34 (Spring Rd.) / SR 850 (Valley Rd.) / Pisgah State Rd.
(40.31955, -77.16513) 		Roundabout
Existing 		All-Way Yield
None 		4 Approaches
0 Driveways
33.5280 		Other (At-Grade)
Single-Lane 		2021
Rockville, MD
Montgomery Co.
United States 		Henderson Circle
(39.08800, -77.16702) 		Other
Existing 		Unknown
Unknown 		4 Approaches
0 Driveways
0.0000 		Other (At-Grade)
Single-Lane 		Pedestrian access to central island.
Potomac, MD
Montgomery Co.
United States 		Larkmeade Ln. / Bells Ridge Dr.
(39.03483, -77.16775) 		Other
Existing 		Unknown
Unknown 		4 Approaches
0 Driveways
0.0000 		Other (At-Grade)
Unknown
King Farm, MD
Montgomery Co.
United States 		Pleasant Circle
(39.11623, -77.17518) 		Other
Existing 		Unknown
Unknown 		4 Approaches
0 Driveways
0.0000 		Other (At-Grade)
Unknown 		Pedestrian access to central island.
Picton, ON
Prince Edward
Canada 		Loyalist Pkwy. / Sandy Hook Rd.
(43.99449, -77.17838) 		Roundabout
Existing 		All-Way Yield
None 		4 Approaches
0 Driveways
40.3828 		Other (At-Grade)
Single-Lane 		2009 This was the first highway roundabout in Ontario. Constructed in 2009. https://www.auto123.com/en/news/ontarios-first-roundabout-intersection-opens-near-picton/5652/ ICD estimated from Google Maps linework.
Gaithersburg, MD
Montgomery Co.
United States 		Victory Farm Dr. / Girard St.
(39.14648, -77.18493) 		Roundabout
Existing 		All-Way Yield
None 		4 Approaches
0 Driveways
25.9348 		Other (At-Grade)
Multilane (2 Lane, unspecified) 		2006 Year Completed estimated (2005-2006). ICD estimated from Google Maps linework.
Carlisle, PA
Cumberland Co.
United States 		B St. / Fairground Ave.
(40.20914, -77.18946) 		Roundabout
Existing 		All-Way Yield
None 		4 Approaches
0 Driveways
0.0000 		Other (At-Grade)
Single-Lane 		2022 https://www.facebook.com/carlislepa/videos/b-street-and-fairground-avenue-roundabout/587170292764586/
Carlisle, PA
Cumberland Co.
United States 		N College St. / B St.
(40.20962, -77.19535) 		Roundabout
Existing 		All-Way Yield
None 		3 Approaches
0 Driveways
0.0000 		Other (At-Grade)
Single-Lane 		2022 https://www.youtube.com/watch?v=KwvSjWacVwI
Potomac, MD
Montgomery Co.
United States 		Broad Green Dr. / Clagett Farm Dr.
(39.04566, -77.19669) 		Other
Existing 		All-Way Yield
Unknown 		4 Approaches
0 Driveways
0.0000 		Other (At-Grade)
Single-Lane
Annandale, VA
Fairfax Co.
United States 		Ravensworth Rd. / Jayhawk St. / Fountain Head Dr.
(38.82630, -77.19993) 		Roundabout
Existing 		All-Way Yield
Unknown 		4 Approaches
0 Driveways
22.8600 		Other (At-Grade)
Single-lane w/ Traversable Central Island 		2018 Modular, rapid-install roundabout.
North Potomac, MD
Montgomery Co.
United States 		Bald Cypress Dr. / Willow Tree Dr. / Cherrydale Dr.
(39.08158, -77.20120) 		Other
Existing 		Unknown
Unknown 		4 Approaches
0 Driveways
0.0000 		Other (At-Grade)
Single-Lane
Gaithersburg, MD
Montgomery Co.
United States 		Washingtonian Blvd. / Rio Blvd.
(39.11678, -77.20122) 		Roundabout
Existing 		All-Way Yield
None 		4 Approaches
0 Driveways
36.5760 		Other (At-Grade)
Multilane (2 Lane, unspecified) 		1998 Year Completed estimated (1993-2002).
Gaithersburg, MD
Montgomery Co.
United States 		Washingtonian Blvd. / Washington Blvd.
(39.11773, -77.20314) 		Roundabout
Existing 		All-Way Yield
None 		3 Approaches
0 Driveways
36.5760 		Other (At-Grade)
Multilane (2 Lane, unspecified) 		1998 Year Completed estimated (1993-2002).
Rockville, MD
Montgomery Co.
United States 		Valley Dr. / Aqua Ln.
(39.07945, -77.20575) 		Other
Existing 		Unknown
Unknown 		3 Approaches
0 Driveways
0.0000 		Other (At-Grade)
Single-Lane
Gaithersburg, MD
Montgomery Co.
United States 		Perry Pkwy. / (parking)
(39.14899, -77.21048) 		Roundabout
Existing 		All-Way Yield
None 		4 Approaches
0 Driveways
47.2440 		Other (At-Grade)
Multilane (2 Lane, 2x1 max) 		2004 Year Completed estimated (2002-2005).
Potomac, MD
Montgomery Co.
United States 		Brickyard Rd. / Horseshoe Ln.
(38.99291, -77.21195) 		Traffic Calming Circle
Existing 		One-Way/Two-Way Stop
Unknown 		4 Approaches
0 Driveways
0.0000 		Other (At-Grade)
Single-Lane
Potomac, MD
Montgomery Co.
United States 		Brickyard Rd. / Hackamore Dr.
(38.98567, -77.21274) 		Traffic Calming Circle
Existing 		One-Way/Two-Way Stop
Unknown 		3 Approaches
0 Driveways
0.0000 		Other (At-Grade)
Single-Lane
Potomac, MD
Montgomery Co.
United States 		10600 Morning Field Dr. / Sunny Brooke Ln. / Sunny Brooke Pl.
(39.07423, -77.21561) 		Other
Existing 		Unknown
Unknown 		3 Approaches
0 Driveways
0.0000 		Other (At-Grade)
Unknown
Potomac, MD
Montgomery Co.
United States 		Brickyard Rd. / Brent Rd.
(38.99900, -77.22362) 		Traffic Calming Circle
Existing 		One-Way/Two-Way Stop
Unknown 		4 Approaches
0 Driveways
0.0000 		Other (At-Grade)
Single-Lane
Gaithersburg, MD
Montgomery Co.
United States 		Upshire Circle
(39.11353, -77.22397) 		Other
Existing 		Unknown
Unknown 		3 Approaches
0 Driveways
0.0000 		Other (At-Grade)
Unknown
Germantown, MD
Montgomery Co.
United States 		Germantown Rd. / Watkins Mill Rd. / Blunt Rd.
(39.19058, -77.22492) 		Roundabout
Existing 		All-Way Yield
None 		3 Approaches
0 Driveways
36.5760 		Other (At-Grade)
Single-Lane 		1999 Right-turn bypass lane on north leg. Year Completed estimated (1993-2005).
Gaithersburg, MD
Montgomery Co.
United States 		Parkview Ave. / Uptown St.
(39.15334, -77.22619) 		Roundabout
Existing 		All-Way Yield
None 		3 Approaches
0 Driveways
36.5760 		Other (At-Grade)
Single-Lane 		2012 Right-turn-only lane on northwest leg. Year Completed estimated (2011-2012).
Gaithersburg, MD
Montgomery Co.
United States 		Orchard Ridge Dr. / Mill Green Ave.
(39.12559, -77.22635) 		Roundabout
Existing 		All-Way Yield
None 		3 Approaches
0 Driveways
37.9872 		Other (At-Grade)
Multilane (2 Lane, unspecified) 		2002 ICD estimated from Google Maps linework.
Gaithersburg, MD
Montgomery Co.
United States 		Winter Walk Dr. / Highland Ridge Ave.
(39.12807, -77.22692) 		Roundabout
Existing 		All-Way Yield
None 		3 Approaches
0 Driveways
34.2800 		Other (At-Grade)
Single-Lane 		1998 Year Completed estimated (1993-2002). Was cul-de-sac prior to addition of two more legs. ICD estimated from Google Maps linework.
Gettysburg, PA
Adams Co.
United States 		Lincoln Square (Chamberburg St. / York St. / Carlisle St. / Baltimore St.)
(39.83092, -77.23112) 		Other
Existing 		All-Way Yield
Unknown 		4 Approaches
0 Driveways
31.1838 		Other (At-Grade)
Single-Lane 		Diagonal parking around circulatory roadway; pedestrian access to center island; no splitter islands. ICD estimated from Google Maps linework.
Travilah, MD
Montgomery Co.
United States 		Marwood Hill Dr. / Rivers Bend Ln.
(39.03022, -77.23432) 		Other
Existing 		Unknown
Unknown 		4 Approaches
0 Driveways
0.0000 		Other (At-Grade)
Single-Lane
Gaithersburg, MD
Montgomery Co.
United States 		Kentlands Blvd. / Market St.
(39.12309, -77.23489) 		Roundabout
Existing 		All-Way Yield
None 		4 Approaches
0 Driveways
41.1480 		Other (At-Grade)
Multilane (2 Lane, 2x1 max) 		1994 Year Completed estimated (1993-2002).
Woodbridge, VA
Prince William Co.
United States 		Belmont Bay Dr. / Course View Way
(38.65403, -77.23640) 		Roundabout
Existing 		All-Way Yield
None 		4 Approaches
0 Driveways
25.1826 		Other (At-Grade)
Single-Lane 		2000 ICD estimated from Google Maps linework.
Woodbridge, VA
Prince William Co.
United States 		Belmont Bay Dr. / Palisades St.
(38.65612, -77.23753) 		Roundabout
Existing 		All-Way Yield
None 		3 Approaches
0 Driveways
35.4412 		Other (At-Grade)
Multilane (2 Lane, unspecified) 		2000 ICD estimated from Google Maps linework.
Gaithersburg, MD
Montgomery Co.
United States 		Kentlands Blvd. / Main St.
(39.12333, -77.23855) 		Roundabout
Existing 		All-Way Yield
None 		4 Approaches
0 Driveways
42.6720 		Other (At-Grade)
Multilane (2 Lane, 2x1 max) 		1994 Year Completed estimated (1993-2002).
Clarksburg, MD
Montgomery Co.
United States 		Little Seneca Pkwy. / Meadow Mist Rd.
(39.23154, -77.24309) 		Roundabout
Existing 		All-Way Yield
None 		4 Approaches
0 Driveways
30.5290 		Other (At-Grade)
Single-Lane 		2011 ICD estimated from Google Maps linework.
Germantown, MD
Montgomery Co.
United States 		Summer Oak Dr. / Summer Oak Ct.
(39.16467, -77.24384) 		Other
Existing 		Unknown
Unknown 		3 Approaches
0 Driveways
0.0000 		Other (At-Grade)
Single-Lane 		No splitter islands on two legs.
Canandaigua, NY
Ontario Co.
United States 		CR 10 / CR 46
(42.88665, -77.24563) 		Roundabout
Existing 		All-Way Yield
None 		4 Approaches
0 Driveways
31.5031 		Other (At-Grade)
Single-Lane 		2013 ICD estimated from Google Maps linework.
Germantown, MD
Montgomery Co.
United States 		Observation Dr. / Goldenrod Ln.
(39.18419, -77.24566) 		Roundabout
Existing 		All-Way Yield
None 		3 Approaches
0 Driveways
45.7200 		Other (At-Grade)
Multilane (2 Lane, 2x2 max) 		2013 Year Completed estimated (2012-2014).
Canandaigua, NY
Ontario Co.
United States 		CR 10 / CR 4
(42.90187, -77.24570) 		Roundabout
Existing 		All-Way Yield
None 		3 Approaches
0 Driveways
33.2451 		Other (At-Grade)
Single-Lane 		2013 ICD estimated from Google Maps linework.