Roundabouts Database Index

30320 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
Catonsville, MD Baltimore Co. United States	Edmundson Avenue / Old Frederick Road (39.27533, -76.76612)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 20.3400	Other (At-Grade) Single-Lane	2010	ICD estimated from Google Maps linework.
Jessup, MD Howard Co. United States	Canine Rd. / MD 32 EB Ramps (39.10101, -76.76953)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 38.0005	Freeway Ramps (Grade-Separated) Single-Lane	2001	ICD estimated from Google Maps linework.
Williamsburg, VA James City Co. United States	Colonial Heritage Blvd. / Harrington Commons / Chapel Xing (37.34606, -76.77094)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 74.0590	Other (At-Grade) Single-Lane	2005	ICD estimated from Google Maps linework.
Odessa, ON Lennox and Addington Canada	CR 2 / CR 4 (44.26179, -76.77489)	Roundabout Existing	All-Way Yield Unknown	4 Approaches 0 Driveways 38.4898	Other (At-Grade) Single-Lane	2009	ICD estimated from Google Maps linework.
Davidsonville Historic District, MD Prince George's Co. United States	Cameron Grove Blvd. / New Acadia Ln. (38.89933, -76.77575)	Other Existing	Unknown Unknown	4 Approaches 0 Driveways 0.0000	Other (At-Grade) Single-Lane
Davidsonville Historic District, MD Prince George's Co. United States	Oak Grove Rd. / (parking) (38.87858, -76.77717)	Other Existing	Unknown Unknown	4 Approaches 0 Driveways 0.0000	Other (At-Grade) Multilane (2 Lane, 2x1 max)
Willamsburg, VA James City Co. United States	Saunders Bridge / S Square / River Moor / Poggio Field (37.25970, -76.77789)	Other Existing	Unknown Unknown	4 Approaches 0 Driveways 33.2698	Other (At-Grade) Single-Lane	2007	No splitter islands. Uncertain traffic control. ICD estimated from Google Maps linework.
Hughesville, MD Charles Co. United States	MD 231 / MD 5 NB Ramps (38.53426, -76.77790)	Roundabout Existing	Unknown Unknown	3 Approaches 0 Driveways 54.1863	Freeway Ramps (Grade-Separated) Multilane (2 Lane, unspecified)	2005	ICD estimated from Google Maps linework.
Hughesville, MD Charles Co. United States	MD 231 / MD 5 SB Ramps (38.53381, -76.77969)	Roundabout Existing	Unknown Unknown	3 Approaches 0 Driveways 58.8579	Freeway Ramps (Grade-Separated) Multilane (2 Lane, unspecified)	2005	ICD estimated from Google Maps linework.
Owings Mills, MD Baltimore Co. United States	Grand Central Ave. / (parking) (39.40581, -76.78033)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 48.7680	Other (At-Grade) Multilane (2 Lane, unspecified)	2014	Year Completed estimated (2011-2014).
Oak Grove, MD Prince Georges Co. United States	MD 193 (Watkins Park Dr.) / Oak Grove Rd. (38.87737, -76.78108)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 38.1207	Other (At-Grade) Single-Lane	2001	ICD estimated from Google Maps linework.
Chaptico, MD St. Marys Co. United States	MD 234 / MD 238 (38.36791, -76.78179)	Roundabout Existing	Unknown Unknown	4 Approaches 0 Driveways 35.5833	Other (At-Grade) Single-Lane	2007	ICD estimated from Google Maps linework.
Ellicott City, MD Howard Co. United States	MD 103 / MD 100 EB Ramps (39.20733, -76.78243)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 30.5396	Freeway Ramps (Grade-Separated) Single-Lane	1998	Opened November 1998. ICD estimated from Google Maps linework.
Williamsburg, VA James City Co. United States	Fords Colony Dr. / St. Andrews Dr. (37.30351, -76.78289)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 66.5009	Other (At-Grade) Single-Lane	2004	ICD estimated from Google Maps linework.
Ellicott City, MD Howard Co. United States	MD 103 / MD 100 WB Ramps (39.20846, -76.78294)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 33.3154	Freeway Ramps (Grade-Separated) Single-Lane	1998	Opened November 1998. ICD estimated from Google Maps linework.
Owings Mills, MD Baltimore Co. United States	Grand Central Ave. / Waverly Ln. (39.40713, -76.78413)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 39.6240	Other (At-Grade) Single-Lane	2014	Year Completed estimated (2011-2014). West leg added 2015.
Annapolis Junction, MD Anne Arundel Co. United States	Guilford Rd. / MD 32 WB Ramps (39.12294, -76.78472)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 32.4293	Freeway Ramps (Grade-Separated) Single-Lane	2002	Bypass lanes on all legs. ICD estimated from Google Maps linework.
Owings Mills, MD Baltimore Co. United States	Tollgate Rd. / Lastgage Rd. (39.42149, -76.78482)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 28.6010	Other (At-Grade) Single-Lane	2004	ICD estimated from Google Maps linework.
Owings Mills, MD Baltimore Co. United States	(unknown) (39.39269, -76.78657)	Other Existing	Unknown Unknown	2 Approaches 0 Driveways 0.0000	Other (At-Grade) Single-Lane
Owings Mills, MD Baltimore Co. United States	Painters Mill Rd. / Lyons Mill Rd. (39.39425, -76.78747)	Other Existing	All-Way Yield Unknown	3 Approaches 0 Driveways 0.0000	Other (At-Grade) Multilane (2 Lane, unspecified)
Ellicott City, MD Howard Co. United States	Academy Rd. / Hillsborough Rd. / Chews Vineyard (39.24993, -76.78913)	Other Existing	Unknown Unknown	4 Approaches 0 Driveways 0.0000	Other (At-Grade) Single-Lane		No splitter islands.
Horseheads, NY Chemung Co. United States	Rte 13 / Old Ithaca Rd. / Breesport Rd. (42.18851, -76.79076)	Roundabout Existing	All-Way Yield Unknown	4 Approaches 0 Driveways 29.2025	Other (At-Grade) Single-Lane	2012	ICD estimated from Google Maps linework.
Ellicott City, MD Howard Co. United States	College Ave. / Bending Sky Way (39.25754, -76.79122)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 26.8186	Other (At-Grade) Single-Lane	2012	ICD estimated from Google Maps linework.
Lingelstown, PA Dauphin Co. United States	Lingelstown Rd. / N. Mountain Rd. (40.34341, -76.79206)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 20.9367	Other (At-Grade) Single-Lane	2011	Previously controlled by two-way stop ICD estimated from Google Maps linework.
Ellicott City, MD Howard Co. United States	Nightingale Ct. / Academy Rd. (39.24564, -76.79297)	Other Existing	Unknown Unknown	2 Approaches 0 Driveways 0.0000	Other (At-Grade) Unknown
Davidsonville, MD Prince George's Co. United States	Marleigh Dr. / Huntchase Dr. (38.95209, -76.79398)	Other Existing	Unknown Unknown	4 Approaches 0 Driveways 0.0000	Other (At-Grade) Unknown		No splitter islands.
Elmira, NY Chemung Co. United States	Maple Ave. / Horner St. (42.08282, -76.79445)	Roundabout Existing	All-Way Yield Unknown	4 Approaches 0 Driveways 17.7281	Other (At-Grade) Single-lane w/ Traversable Central Island	2012	Year completed estimated (2011-2013). ICD estimated from Google Maps linework.
Ellicott City, MD Howard Co. United States	Hillsborough Rd. / English Morning Ln. (39.25046, -76.79507)	Other Existing	Unknown Unknown	3 Approaches 0 Driveways 0.0000	Other (At-Grade) Single-Lane		No splitter islands.
Ellicott City, MD Howard Co. United States	Snowden River Pkwy. / MD 100 WB Ramps (39.21233, -76.79544)	Roundabout Existing	All-Way Yield Metering Signal	3 Approaches 0 Driveways 25.9105	Freeway Ramps (Grade-Separated) Single-Lane	1998	Opened November 1998. Metering signal on Snowden River Pkwy approach. ICD estimated from Google Maps linework.
Elmira, NY Chemung Co. United States	Maple Ave. / Caldwell Ave. (42.08399, -76.79589)	Roundabout Existing	All-Way Yield Unknown	4 Approaches 0 Driveways 8.8639	Other (At-Grade) Single-lane w/ Traversable Central Island	2012	Year completed estimated (2011-2013). ICD estimated from Google Maps linework.
Lingelstown, PA Dauphin Co. United States	Lingelstown Rd. / Blue Mountain Pkwy. (40.34253, -76.79711)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 24.5782	Other (At-Grade) Single-Lane	2011	Previously controlled by two-way stop ICD estimated from Google Maps linework.
Owings Mills, MD Baltimore Co. United States	Ballard Green Dr. / Wilson Shannon Dr. / Julia Ln. (39.39162, -76.80439)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 36.5760	Other (At-Grade) Single-Lane	2017	Year Completed estimated (2017-2018).
Horseheads, NY Chemung Co. United States	Rte 13 / E. Franklin St. (42.16756, -76.80553)	Roundabout Existing	All-Way Yield Unknown	4 Approaches 0 Driveways 32.7531	Other (At-Grade) Single-Lane	2012	ICD estimated from Google Maps linework.
Horseheads, NY Chemung Co. United States	Rte 13 / Horseheads Connector Rd. (42.17077, -76.80564)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 0.0000	Other (At-Grade) Single-Lane	2023
Ellicott City, MD Howard Co. United States	MD 104 (Waterloo Rd.) / MD 100 WB Ramps (39.22470, -76.80600)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 45.7200	Freeway Ramps (Grade-Separated) Multilane (2 Lane, 2x2 max)	1999
Toano, VA James City Co. United States	Weathers Blvd. / Kenton Ct. (37.40490, -76.80636)	Other Existing	Unknown Unknown	4 Approaches 0 Driveways 0.0000	Other (At-Grade) Single-Lane
Owings Mills, MD Baltimore Co. United States	New Town Blvd. / Rangeford Dr. (39.40957, -76.80654)	Other Existing	Unknown Unknown	4 Approaches 0 Driveways 0.0000	Other (At-Grade) Single-Lane
Long Reach, MD Howard Co. United States	Shining Oceans Way / Dried Earth Blvd. (39.18977, -76.80673)	Other Existing	Unknown Unknown	3 Approaches 0 Driveways 0.0000	Other (At-Grade) Single-Lane		No splitter islands.
Lake Arbor, MD Prince George's Co. United States	Lake Arbor Way / Congressional Ct. (38.90201, -76.80962)	Other Existing	Unknown Unknown	4 Approaches 0 Driveways 0.0000	Other (At-Grade) Single-Lane
Elmira, NY Chemung Co. United States	N Main St. / Park Pl. / W 3rd St. (42.09278, -76.80993)	Roundabout Existing	All-Way Yield None	5 Approaches 0 Driveways 33.6780	Other (At-Grade) Single-Lane	2019	https://www.mytwintiers.com/local-news-3/elmira-cultural-connectors-ribbon-cutting-took-place-and-the-roundabout-is-officially-open/ ICD estimated from Google Maps linework.
Columbia, MD Howard Co. United States	Golden Straw Ln. / Davis Rd. (39.21597, -76.81084)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways	Other (At-Grade) Single-lane w/ Traversable Central Island	2000	Completed April 28, 2000. Pedestrian ramps into circulatory roadway.
Columbia, MD Howard Co. United States	Golden Straw Ln. / Long Meadow Ct. (39.21441, -76.81085)	Traffic Calming Circle Existing	Other None	3 Approaches 0 Driveways 99.0123	Other (At-Grade) Single-Lane	2000	Yield control only on west leg. ICD estimated from Google Maps linework.
Ellicott City, MD Howard Co. United States	Rogers Ave / Old Frederick Road (39.29904, -76.81308)	Roundabout Existing	All-Way Yield None	3 Approaches 1 Driveways 26.8026	Other (At-Grade) Single-Lane	2004	ICD estimated from Google Maps linework. Old Frederick Road is MD 985A but roundabout may be locally maintained and not state maintained
Reisterstown, MD Baltimore Co. United States	Winged Foot Dr. / Crystal Downs Ct. / Kauri Cliffs Rd. (39.42897, -76.81445)	Other Existing	Unknown Unknown	4 Approaches 0 Driveways 0.0000	Other (At-Grade) Single-Lane		No splitter islands.
Villages of Winterset, MD Baltimore Co. United States	Runnymeade Rd. / New Town Blvd. / Bon Haven Ln. (39.39893, -76.81700)	Other Existing	Unknown Unknown	4 Approaches 0 Driveways 0.0000	Other (At-Grade) Single-Lane
Horseheads, NY Chemung Co. United States	Old Ithaca Rd. / Horseheads Connector Rd. / E St. (42.17554, -76.81741)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 0.0000	Other (At-Grade) Single-Lane	2023
Upper Marlboro, MD Prince George's Co. United States	Thomas Sim Lee Terrace / Mary Digges Pl. (38.81663, -76.81748)	Other Existing	Unknown Unknown	4 Approaches 0 Driveways 0.0000	Other (At-Grade) Single-Lane
Lake Arbor, MD Prince George's Co. United States	Lake Arbor Way / Golf Course Dr. (38.90618, -76.81975)	Other Existing	Unknown Unknown	4 Approaches 0 Driveways 0.0000	Other (At-Grade) Single-Lane
Owings Mills, MD Baltimore Co. United States	Upper Mill Dr. / Bluestem Ct. /Spring Willow Ct. / Bayline Cir. (39.41253, -76.82032)	Other Existing	Unknown Unknown	4 Approaches 0 Driveways 0.0000	Other (At-Grade) Single-Lane		No splitter islands.
Lake Arbor, MD Prince George's Co. United States	Lake Arbor Way / Fairlakes Pl (38.90717, -76.82304)	Other Existing	Unknown Unknown	4 Approaches 0 Driveways 0.0000	Other (At-Grade) Single-Lane
Savage, MD Howard Co. United States	Washington St. / Foundry St. (39.13656, -76.82513)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 18.2880	Other (At-Grade) Single-lane w/ Traversable Central Island	2021	Painted splitter islands. Pedestrian crossing on west leg adjacent to circulatory roadway. https://www.howardcountymd.gov/News120121
Columbia, MD Howard Co. United States	Tamar Dr. / Old Montgomery Rd. (39.20533, -76.82822)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 30.4800	Other (At-Grade) Single-Lane	2022	https://www.howardcountymd.gov/News090122c
Muncy, PA Lycoming Co. United States	Lycoming Mall Circle (41.24320, -76.82846)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 28.7372	Other (At-Grade) Single-Lane	2009	ICD estimated from Google Maps linework.
Columbia, MD Howard Co. United States	Oakland Mills Rd. / Old Montgomery Rd. (39.20788, -76.83157)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 38.1000	Other (At-Grade) Single-Lane	2017
Ellicott City, MD Howard Co. United States	Columbia Rd. / Hemlock Cone Way / Kingscup Ct. (39.24949, -76.83326)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 21.3360	Other (At-Grade) Single-lane w/ Traversable Central Island	2019
Upper Marlboro, MD Prince George's Co. United States	Woodyard Rd. / Observatory Pl. (38.82198, -76.83374)	Other Existing	Unknown Unknown	3 Approaches 0 Driveways 0.0000	Other (At-Grade) Single-Lane		Parking along circulatory roadway.
Columbia, MD Howard Co. United States	Oakland Mills Rd. / MD 175 SB Ramps / (unknown) (39.21308, -76.83456)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 36.5760	Freeway Ramps (Grade-Separated) Single-Lane	2017	Year Completed estimated (2016-2017).
Hampstead, MD Carroll Co. United States	MD 88 / MD 833 (39.60434, -76.83682)	Roundabout Existing	Unknown Unknown	4 Approaches 0 Driveways 34.0470	Other (At-Grade) Single-Lane	2004	ICD estimated from Google Maps linework.
Columbia, MD Howard Co. United States	Cradlerock Way / Homespun Dr. (39.19095, -76.83787)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 22.2158	Other (At-Grade) Single-Lane	2001	Completed May 21, 2001. Previously controlled by one-way stop Functional Class: Collector ICD estimated from Google Maps linework.
Summerfield, MD Prince George's Co. United States	Saint Josephs Dr. / Grove Hurst Ln. (38.91969, -76.84060)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 53.3400	Other (At-Grade) Multilane (2 Lane, unspecified)	2012
Laurel, MD Howard Co. United States	Weathered Stone Way / Boulder Ridge Rd. / Stone Lake Dr. (39.13774, -76.84066)	Other Existing	Unknown Unknown	3 Approaches 0 Driveways 0.0000	Other (At-Grade) Single-Lane
Ritchie, MD Prince Georges Co. United States	Ritchie-Marlboro Rd. / I-95 NB Ramps (38.86824, -76.84158)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 67.0560	Freeway Ramps (Grade-Separated) Multilane (3+ Lane)	2001	Opened initially with two lanes. Expanded from two lanes to three lanes in 2010. 21442
Bowie, MD Prince George's Co. United States	Faircrest Circle (38.92760, -76.84166)	Other Existing	Unknown Unknown	2 Approaches 18 Driveways 0.0000	Other (At-Grade) Single-Lane
Laurel, MD Howard Co. United States	Whiskey Bottom Rd. / All Saints Rd. (39.12478, -76.84257)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 25.9428	Other (At-Grade) Single-Lane	2007	ICD estimated from Google Maps linework.
Hampstead, MD Carroll Co. United States	MD 30 (Hampstead Bypass) / Business MD 30 (Hanover Pike) (39.58178, -76.84261)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 56.1498	Other (At-Grade) Multilane (2 Lane, unspecified)	2009	ICD estimated from Google Maps linework.
Upper Marlboro, MD Prince George's Co. United States	Central Park Dr. / Rock Spring Dr. (38.83296, -76.84354)	Roundabout Existing	All-Way Yield Unknown	3 Approaches 0 Driveways 50.2920	Other (At-Grade) Multilane (2 Lane, unspecified)	2016
Laurel, MD Howard Co. United States	Boulder Ridge Rd. / Polished Pebble Way (39.13864, -76.84358)	Other Existing	Unknown Unknown	3 Approaches 0 Driveways 0.0000	Other (At-Grade) Single-Lane		No splitter islands.
Summerfield, MD Prince George's Co. United States	Ruby Lockhart Blvd. / Taj Ln. (38.92163, -76.84438)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 48.7680	Other (At-Grade) Multilane (2 Lane, unspecified)	2011
Summerfield, MD Prince George's Co. United States	Campus Way / Geaton Park Pl. (38.92577, -76.84451)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 48.7680	Other (At-Grade) Multilane (2 Lane, unspecified)	2011
Upper Marlboro, MD Prince George's Co. United States	Rock Spring Dr. / (unknown) (38.83762, -76.84567)	Roundabout Existing	All-Way Yield Unknown	3 Approaches 0 Driveways 51.8160	Other (At-Grade) Multilane (2 Lane, unspecified)	2018	Year Completed estimated (2018-2019).
Laurel, MD Howard Co. United States	Stephens Rd. / Whiskey Bottom Rd. (39.12704, -76.84608)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 29.6480	Other (At-Grade) Single-Lane	2005	ICD estimated from Google Maps linework.
Glenarden, MD Prince George's Co. United States	Ruby Lockhart Blvd. / Campus Way (38.92345, -76.84696)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 48.7680	Other (At-Grade) Multilane (2 Lane, unspecified)	2011
Ritchie, MD Prince Georges Co. United States	Ritchie-Marlboro Rd. / I-95 SB Ramps (38.86894, -76.84738)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 770.9968	Freeway Ramps (Grade-Separated) Multilane (3+ Lane)	2001	Opening initially with two lanes. Expanded from two lanes to three lanes in 2010. 21442
Columbia, MD Howard Co. United States	Stevens Forest Rd. / Farewell Rd. / Night Street Hill (39.20114, -76.84781)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 27.4320	Other (At-Grade) Single-lane w/ Traversable Central Island	2019
Glenarden, MD Prince George's Co. United States	Campus Way N / Woodmore Center Dr. (38.92263, -76.84787)	Other Existing	All-Way Yield Unknown	4 Approaches 0 Driveways 0.0000	Other (At-Grade) Single-Lane		Inside shopping center. No splitter islands on northwest and southeast legs.
Glenarden, MD Prince George's Co. United States	Campus Way N / McHugh Dr. (38.92127, -76.84944)	Other Existing	All-Way Yield Unknown	4 Approaches 0 Driveways 0.0000	Other (At-Grade) Single-Lane		Inside shopping center. No splitter islands on northwest and southeast legs.
Glenarden, MD Prince George's Co. United States	Ruby Lockhart Blvd. / Evarts St. / Sir Michael Pl. (38.92506, -76.84953)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 48.7680	Other (At-Grade) Multilane (2 Lane, unspecified)	2011	Double left-turn and double right-turn movements.
Capitol Heights, MD Prince George's Co. United States	Ritchie Station Ct. / (mall circulation road) (38.86528, -76.84986)	Roundabout Existing	All-Way Yield None	3 Approaches 1 Driveways 41.1480	Other (At-Grade) Single-Lane	2011	Year Completed estimated (2010-2011).
Capitol Heights, MD Prince George's Co. United States	Hampton Park Blvd. (38.87175, -76.85022)	Roundabout Existing	All-Way Yield Unknown	2 Approaches 0 Driveways 57.9120	Other (At-Grade) Multilane (2 Lane, 2x2 max)	2007	Yield signs but no entrance line or yield lines.
Columbia, MD Howard Co. United States	Vantage Point Rd. (39.22074, -76.85392)	Other Existing	Unknown Unknown	3 Approaches 0 Driveways 0.0000	Other (At-Grade) Unknown
Southport, NY Chemung Co. United States	Pennsylvania Ave. / Rte 328 (SB Direction) (42.04228, -76.85541)	Roundabout Existing	All-Way Yield Unknown	3 Approaches 0 Driveways 39.0266	Other (At-Grade) Single-Lane	2016	Yield-controlled right-turn bypass lanes on north and west legs. Year Completed estimated (2013-2016). ICD estimated from Google Maps linework.
Laurel, MD Prince George's Co. United States	Montrose Ave. / Harrison Dr. (39.09979, -76.85955)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 24.3840	Other (At-Grade) Single-Lane	2008	Year Completed estimated (2007-2008).
Summerfield, MD Prince George's Co. United States	Ridgefield Blvd. / Chatsfield Way / Valley Trail Ln. (38.89834, -76.86172)	Other Existing	Unknown Unknown	3 Approaches 0 Driveways 0.0000	Other (At-Grade) Multilane (2 Lane, unspecified)
Spring Grove, PA York Co. United States	Rte. 116 (Hanover St.) / Roths Church Rd. / W. Hanover St. (39.88301, -76.86363)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 47.6567	Other (At-Grade) Single-Lane	2007	http://www.yorkdispatch.com/local/ci_6708523 ICD estimated from Google Maps linework.
Laurel, MD Howard Co. United States	Old Scaggsville Rd. / High Ridge Rd. / Running Deer Dr. (39.11815, -76.86396)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 27.7985	Other (At-Grade) Single-Lane	2015	ICD estimated from Google Maps linework.
Hampstead, MD Carroll Co. United States	MD 30 (Hampstead Bypass) / MD 482 (Hampstead Mexico Rd.) (39.61108, -76.86457)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 53.3657	Other (At-Grade) Multilane (2 Lane, unspecified)	2009	ICD estimated from Google Maps linework.
Newport, NC Carteret Co. United States	White Sands Blvd. / Deer Run / Merry Woods Dr. (34.80021, -76.86634)	Other Existing	Unknown Unknown	4 Approaches 0 Driveways 0.0000	Other (At-Grade) Single-Lane		No splitter islands.
Hampstead, MD Carroll Co. United States	MD-30 (Hampstead Bypass) / Business MD 30 (Hanover Pike) (39.63466, -76.86675)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 49.6684	Other (At-Grade) Multilane (2 Lane, unspecified)	2009	ICD estimated from Google Maps linework.
Columbia, MD Howard Co. United States	Owen Brown Rd. / Martin Rd. (39.19989, -76.86930)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 28.9560	Other (At-Grade) Single-Lane	2004	Year Completed estimated (2002-2005).
Harrisburg, PA Dauphin Co. United States	Derry St. / Mulberry St. (40.26312, -76.86948)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 0.0000	Other (At-Grade) Single-lane w/ Traversable Central Island	2022	https://theburgnews.com/news/project-to-make-harrisburgs-mulder-square-safer-greener-nears-completion
Columbia, MD Howard Co. United States	Banneker Rd. / Cul-de-sac (39.21141, -76.87041)	Traffic Calming Circle Existing	Unknown Unknown	3 Approaches 0 Driveways 17.5824	Other (At-Grade) Single-Lane		Functional Class: Local ICD estimated from Google Maps linework.
Greenbelt, MD Prince Georges Co. United States	Hanover Pkwy. / Village Park Dr. / Schrom Hills Community Park entrance (38.98378, -76.87333)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 19.4960	Other (At-Grade) Single-Lane	1998	Year Completed estimated (1994-2001). ICD estimated from Google Maps linework.
Ellicott City, MD Howard Co. United States	Coventry Court Dr. (39.27862, -76.87340)	Other Existing	Unknown Unknown	2 Approaches 2 Driveways 0.0000	Other (At-Grade) Unknown
Lower Allen, PA Cumberland Co. United States	Tisbury Circle (40.22128, -76.87520)	Other Existing	Unknown Unknown	3 Approaches 0 Driveways 0.0000	Other (At-Grade) Single-Lane		No splitter islands.
Brandywine, MD Prince George's Co. United States	MD 373 / Accokeek Rd. / MD 5 (Branch Ave.) SB On-Ramp (38.70076, -76.87599)	Roundabout Existing	All-Way Yield None	2 Approaches 0 Driveways 39.6240	Freeway Ramps (Grade-Separated) Single-Lane	2019	MD 5 (Branch Ave.) was converted to limited access. https://www.thebaynet.com/articles/0419/newtrafficshiftstartsinbrandywineareathursday.html.
Southport, NY Chemung Co. United States	Rte 328 / Pennsylvania Ave. (42.03433, -76.87601)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 48.7894	Other (At-Grade) Single-Lane	2015	ICD estimated from Google Maps linework.
Greenbelt, MD Prince George's Co. United States	Hanover Pkwy. / (unknown) (38.98589, -76.87602)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 24.3840	Other (At-Grade) Single-Lane	2004	Year Completed estimated (2002-2005).
Konterra, MD Prince George's Co. United States	Belle Chasse Blvd. / Belle Chasse Blvd. (southeast) (39.07714, -76.87923)	Other Existing	Unknown Unknown	3 Approaches 0 Driveways 0.0000	Other (At-Grade) Single-Lane		No splitter islands.
Konterra, MD Prince George's Co. United States	Belle Chasse Blvd. / Belle Chasse Blvd. (north) (39.07820, -76.87960)	Other Existing	Unknown Unknown	3 Approaches 0 Driveways 0.0000	Other (At-Grade) Single-Lane		No splitter islands.
Konterra, MD Prince George's Co. United States	Belle Chasse Blvd. / (parking) (east) (39.07499, -76.87964)	Other Existing	Unknown Unknown	3 Approaches 0 Driveways 0.0000	Other (At-Grade) Single-Lane		No splitter islands.