Roundabouts Database Index

29465 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
Inwood, WV Berkeley Co. United States	SR 51 (Gerrardstown Rd.) / Pilgrim St. (39.36208, -78.04223)	Roundabout Existing	All-Way Yield At-grade Rail Crossing Signals/Gates (controlling approach only)	4 Approaches 0 Driveways 0.0000	Other (At-Grade) Multilane (2 Lane, 2x1 max)	2022	At-grade rail crossing approximately 200 ft east. Year Completed estimated (2021-2023).
West Chester Township, OH Butler Co. United States	Tylersville Rd. / Beckett Rd. / (parking) (39.36211, -84.45517)	Roundabout Existing	All-Way Yield Rectangular Rapid Flashing Beacon (RRFB)	3 Approaches 1 Driveways 45.7200	Other (At-Grade) Single-Lane	2023	This is the 40th roundabout in Butler County. The Butler County Engineer's Office has planned, designed, reviewed, or constructed 37 out of the 40.
Inwood, WV Berkeley Co. United States	SR 51 (Gerrardstown Rd.) / I-81 SB Ramps / Arden-Nollville Rd. (39.36247, -78.04925)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 0.0000	Freeway Ramps (Grade-Separated) Multilane (2 Lane, 2x1 max)	2023	https://www.journal-news.net/news/local-news/official-phase-one-of-i-81-inwood-bypass-nearly-done/article_87d020ff-2d39-5835-8d9a-c25afa4402ea.html
Ross Township, OH Butler Co. United States	SR 748 (Millville Shandon Rd.) / Layhigh Rd. (39.36255, -84.69648)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 42.4761	Other (At-Grade) Single-Lane	2015	ICD estimated from Google Maps linework.
Inwood, WV Berkeley Co. United States	SR 51 (Gerrardstown Rd.) / I-81 NB Ramps (39.36263, -78.04701)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 0.0000	Freeway Ramps (Grade-Separated) Multilane (2 Lane, 2x1 max)	2023	https://www.journal-news.net/news/local-news/official-phase-one-of-i-81-inwood-bypass-nearly-done/article_87d020ff-2d39-5835-8d9a-c25afa4402ea.html
Castle Rock, CO Douglas Co. United States	N Ridge Rd. / Miller Blvd. (39.36484, -104.81766)	Roundabout Existing	All-Way Yield Unknown	3 Approaches 0 Driveways 47.0915	Other (At-Grade) Single-Lane	2009	Free-flowing right-turn bypass lane on north leg. Year Completed estimated (2008-2011). ICD estimated from Google Maps linework.
Basalt, CO Pitkin Co. United States	Emma Rd. / Basalt Ave. (39.36484, -107.03476)	Other Existing	Unknown None	4 Approaches 0 Driveways 0.0000	Other (At-Grade) Single-Lane		Painted splitter islands.
Ballenger Creek, MD Frederick Co. United States	Newton Dr. / Hiteshow Dr. / Cheatham Way (39.36597, -77.44595)	Other Existing	Unknown Unknown	5 Approaches 0 Driveways 0.0000	Other (At-Grade) Unknown
Frederick, MD Frederick Co. United States	Ballenger Creek Pike (MD 351) / Elmer Derr Rd. / English Muffin Way (39.36625, -77.45071)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 37.8571	Other (At-Grade) Single-Lane	2012	Year Completed estimated (2011-2012). ICD estimated from Google Maps linework.
Mason, OH Warren Co. United States	Mason Rd. / Sarah Dr. (39.36641, -84.31909)	Roundabout Existing	All-Way Yield Unknown	4 Approaches 0 Driveways 32.3170	Other (At-Grade) Single-Lane	2010	ICD estimated from Google Maps linework.
Kearney, MO Clay Co. United States	Watson Dr. / (parking access) (39.36660, -94.36970)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 29.5469	Other (At-Grade) Single-Lane	2015	ICD estimated from Google Maps linework.
Kearney, MO Clay Co. United States	Rte 92-W 6th St. / Sam Barr Dr. (39.36785, -94.38055)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 47.0895	Other (At-Grade) Multilane (2 Lane, unspecified)	2013	ICD estimated from Google Maps linework.
Kearney, MO Clay Co. United States	Rte 92-W 6th St. / Nation Rd. (39.36791, -94.38893)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 49.8594	Other (At-Grade) Single-Lane	2013	ICD estimated from Google Maps linework.
Ballenger Creek, MD Frederick Co. United States	McLauren Ln. / Carston Ct. / Duncan Pl. (39.36852, -77.43743)	Other Existing	Unknown Unknown	4 Approaches 0 Driveways 0.0000	Other (At-Grade) Single-Lane		No splitter islands.
Smithville, MO Clay Co. United States	MO-92 / S Commercial Ave. (39.36881, -94.57949)	Roundabout Existing	All-Way Yield Unknown	4 Approaches 0 Driveways 36.9324	Other (At-Grade) Single-Lane	2009	ICD estimated from Google Maps linework.
Castle Rock, CO Douglas Co. United States	S Wilcox St. / South St. (39.36917, -104.86011)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 0.0000	Other (At-Grade) Single-Lane	2021	http://crgov.com/3296/Wilcox-and-South-Roundabout
Castle Rock, CO Douglas Co. United States	N Ridge Rd. / E Enderud Blvd. (39.36979, -104.82294)	Roundabout Existing	All-Way Yield Unknown	3 Approaches 0 Driveways 44.3183	Other (At-Grade) Multilane (2 Lane, unspecified)	2007	ICD estimated from Google Maps linework.
Liberty Township, OH Butler Co. United States	Veterans Blvd. / Reagan Way (39.37030, -84.35617)	Roundabout Existing	All-Way Yield Rectangular Rapid Flashing Beacon (RRFB)	4 Approaches 0 Driveways 54.8637	Other (At-Grade) Multilane (2 Lane, 2x1 max)	2022	New roundabout on new alignment, Veterans Blvd, constructed for new commercial development (Costco).
Liberty Township, OH Butler Co. United States	Veterans Blvd. / Bell Blvd. (39.37220, -84.35684)	Roundabout Existing	All-Way Yield Rectangular Rapid Flashing Beacon (RRFB)	4 Approaches 0 Driveways 54.8637	Other (At-Grade) Multilane (2 Lane, 2x1 max)	2022	New road, Veterans Blvd, constructed for new development.
Hamilton, OH Butler Co. United States	Hamilton Mason Rd. / LeSourdsville West Chester Rd. (39.37223, -84.42497)	Roundabout Existing	All-Way Yield Unknown	4 Approaches 0 Driveways 40.6237	Other (At-Grade) Single-Lane	2018	Opened August 2018. ICD estimated from Google Maps linework.
Liberty Township, OH Butler Co. United States	SR 129 / Cox Rd. / Veterans Blvd. (39.37289, -84.36015)	Roundabout Existing	All-Way Yield Rectangular Rapid Flashing Beacon (RRFB)	4 Approaches 0 Driveways 62.4840	Other (At-Grade) Multilane (2 Lane, 2x2 max)	2022	New roundabout partially opened in November 2022. Full operation is scheduled in mid-December 2022. SR 129 highway was extended to Cox Road (local road) and new alignment (Veterans Blvd) was constructed to help alleviate traffic congestion and safety issues involving Liberty Way interchange with I-75.
Fairfield Township, OH Butler Co. United States	Hamilton Mason Rd. / Liberty Fairfield Rd. (39.37527, -84.48046)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 40.6219	Other (At-Grade) Single-Lane	2008	Since completion, has reduced accidents by 80%. Replaced two offset T intersections. Previously controlled by two-way stop Functional Class: Major Collector ICD estimated from Google Maps linework.
Castle Highlands, CO Douglas Co. United States	Wolfensberger Rd. / Plum Creek Pkwy. / Coachline Rd. (39.37564, -104.88568)	Roundabout Existing	All-Way Yield Unknown	4 Approaches 0 Driveways 51.8160	Other (At-Grade) Multilane (2 Lane, 2x2 max)	2018	Year Completed estimated (2017-2019).
Sykesville, MD Carroll Co. United States	Smithfield Ave. / Warfield Ave. (39.37673, -76.96410)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 47.0835	Other (At-Grade) Multilane (2 Lane, unspecified)	2007	Elliptical shape. ICD estimated from Google Maps linework.
Mason, OH Warren Co. United States	Mason Montgomery Rd. / Bethany Rd. (39.37924, -84.30723)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 49.8513	Other (At-Grade) Single-Lane	2015	Right turn lanes on all approaches, expandable to 2 lanes. ICD estimated from Google Maps linework.
Hamilton, OH Butler Co. United States	Hamilton Mason Rd. / Hamilton Enterprise Park Dr. / Gilmore Rd. (39.37927, -84.51743)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 40.6196	Other (At-Grade) Single-Lane	2019	Existing Gilmore Road was relocated to align with existing Hamilton Enterprise Park Dr. A single-lane modern roundabout with 150' inscribed diameter. ICD estimated from Google Maps linework.
Castle Rock, CO Douglas Co. United States	Autumn Sage St. / Valley View Dr. (39.38026, -104.81919)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 62.4840	Other (At-Grade) Single-Lane	2016	Year Completed estimated (2015-2017).
Ijamsville, MD Frederick Co. United States	Royal Saint Andrews Pl. / Quail Creek Pl. (39.38039, -77.30788)	Other Existing	Unknown Unknown	3 Approaches 0 Driveways 0.0000	Other (At-Grade) Unknown
Fairfield Township, OH Butler Co. United States	Hamilton Mason Rd. / Hancock Ave. / Grand Blvd. / Tuley Rd. / Tylersville Rd. (39.38134, -84.53572)	Roundabout Existing	All-Way Yield None	5 Approaches 0 Driveways 0.0000	Other (At-Grade) Single-Lane	2022	https://www.journal-news.com/news/five-points-roundabout-construction-to-happen-in-2022-in-hamilton/XYJYRDXKBVEK7DSQ7RPFT7RNFA/
Ballenger Creek, MD Frederick Co. United States	Holiday Dr. / Spectrum Dr. (39.38178, -77.40206)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 44.1960	Other (At-Grade) Multilane (2 Lane, unspecified)	2008	Left turn lane trap in circulatory roadway.
Castle Rock, CO Douglas Co. United States	N Rocky View Rd. / Valley View Rd. / High Point Rd. (39.38189, -104.81125)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 62.4840	Other (At-Grade) Single-Lane	2016	Year Completed estimated (2015-2017).
Frederick, MD Frederick Co. United States	Jefferson Pike (MD 180) / Mt Zion Rd. (39.38286, -77.48054)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 36.9250	Other (At-Grade) Single-Lane	2019	Opened August 2019. https://www.fredericknewspost.com/news/politics_and_government/public_safety/md-roundabout-opened/article_e67c26f7-ac5c-5931-b2e0-9e68faaa77d7.html ICD estimated from Google Maps linework.
Mount Washington, MD Baltimore Co. United States	Quarry Lake Dr. / Stone Cliff Dr. (39.38398, -76.69603)	Other Existing	Other Unknown	2 Approaches 1 Driveways 0.0000	Other (At-Grade) Single-Lane		Uncontrolled entry on southeast leg.
Castle Rock, CO Douglas Co. United States	Autumn Sage St. / Copper Cloud Dr. / Trail Stone Cir. (39.38614, -104.82199)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 57.2310	Other (At-Grade) Single-Lane	2005	Year Completed estimated (2005-2006). ICD estimated from Google Maps linework.
Liberty Township, OH Butler Co. United States	Princeton Rd. / Maud Hughes Rd. (39.38674, -84.41100)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 39.6240	Other (At-Grade) Single-Lane	2023	This is Butler County's 41st roundabout. It opened November 16th, 2023. https://www.bceo.org/news/2023/03/princeton-rd-roundabout-bridge-construction-begins/
Pikesville, MD Baltimore Co. United States	Travertine Dr. (39.38721, -76.68990)	Other Existing	Unknown Unknown	4 Approaches 0 Driveways 0.0000	Other (At-Grade) Unknown		Parking along circulatory roadway; pedestrian access to central island.
Basalt, CO Eagle Co. United States	Willits Ln. / E Valley Rd. (39.38865, -107.08520)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 38.7680	Other (At-Grade) Single-Lane	2011	https://www.aspentimes.com/news/willits-lane-roundabout-due-for-work/ https://www.gouldconstruction.com/willits-lane-east-valley-road-roundabout-2/ ICD estimated from Google Maps linework.
Williamstown, WV Wood Co. United States	Highland Ave. (WV 14) / Williamstown Pike (WV 31) (39.38888, -81.44158)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 0.0000	Other (At-Grade) Single-Lane	2020	https://www.newsandsentinel.com/news/local-news/2020/11/williamstown-roundabout-opens-to-traffic/ https://www.youtube.com/watch?v=iusQxGx9zLA
Linganore, MD Frederick Co. United States	Old National Pike / Eaglehead Dr. (39.38995, -77.31098)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 50.2920	Other (At-Grade) Multilane (2 Lane, unspecified)	2008	South leg stubbed. Constructed initially as single-lane roundabout in 2007-2008. Expanded into two-lane roundabout 2016-2018.
Linganore, MD Frederick Co. United States	Mussetter Rd. / Whiterose Dr. / Whiterose Way (39.39008, -77.29747)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 41.1480	Other (At-Grade) Single-Lane	2002	Painted splitter islands on three legs. Year Completed estimated (1988-2005).
Liberty Township, OH Butler Co. United States	Hughes Woods Ln. / Hughes Ridge Ln. (39.39099, -84.40464)	Other Existing	All-Way Yield None	3 Approaches 0 Driveways 43.3818	Other (At-Grade) Single-Lane	1998	No splitter islands. ICD estimated from Google Maps linework.
Liberty Twp, OH Butler Co. United States	Princeton Rd. / Yankee Rd. (39.39133, -84.38398)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 35.9975	Other (At-Grade) Single-Lane	2017	Opened in August 2017. 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).
Castle Rock, CO Douglas Co. United States	Rising Sun Dr. / Autumn Sage St. (39.39210, -104.82736)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 47.0731	Other (At-Grade) Single-Lane	2005	Year Completed estimated (2004-2007). ICD estimated from Google Maps linework.
Ballenger Creek, MD Frederick Co. United States	Jefferson Technology Pkwy. / Jefferson Station Blvd. (39.39223, -77.45291)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 42.6720	Other (At-Grade) Multilane (2 Lane, unspecified)	2014	Year Completed estimated (2013-2015).
Ballenger Creek, MD Frederick Co. United States	Jefferson Technology Pkwy. / (unknown) (39.39256, -77.45666)	Unknown Existing	Unknown Unknown	4 Approaches 0 Driveways 0.0000	Other (At-Grade) Unknown
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
Liberty Township, OH Butler Co. United States	Berkshire Pl. / Amberly Ct. / Wiltshire Ct. (39.39282, -84.34687)	Other Existing	All-Way Stop None	4 Approaches 0 Driveways 27.6898	Other (At-Grade) Single-Lane	2002	Stop control and no splitter islands. ICD estimated from Google Maps linework.
New Market, MD Frederick Co. United States	Eaglehead Dr. / Pecking Stone St. (39.39397, -77.30943)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 24.3840	Other (At-Grade) Single-lane w/ Traversable Central Island	2016	Year Completed estimated (2015-2017).
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)
New Market, MD Frederick Co. United States	Empire Blvd. / Edwardian Ln. / Jacobian Pl. (39.39428, -77.29567)	Other Existing	Unknown Unknown	3 Approaches 0 Driveways 0.0000	Other (At-Grade) Single-Lane		Parking along circulatory roadway.
Liberty Township, OH Butler Co. United States	Carriage House Blvd. / Thoroughbred Ln. / Winner Circle Dr. (39.39434, -84.45087)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 35.0730	Other (At-Grade) Single-Lane	2014	ICD estimated from Google Maps linework.
Liberty Township, OH Butler Co. United States	The Trails Blvd. / Kensington Trl. / Windsor Trl. / Cambridge Trl. (39.39451, -84.34693)	Other Existing	All-Way Stop None	4 Approaches 0 Driveways 50.7634	Other (At-Grade) Single-Lane	2002	Stop control; no splitter islands. ICD estimated from Google Maps linework.
Frederick, MD Frederick Co. United States	Jefferson Station Blvd. / Jefferson Commons Way (39.39479, -77.44916)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 45.7200	Other (At-Grade) Multilane (2 Lane, 2x1 max)	2015	Year Completed estimated (2013-2015).
Brigantine, NJ Atlantic Co. United States	Brigantine Blvd. / Bayshore Ave. / 34th St. S / (unknown) / (parking lot) (39.39482, -74.38953)	Other Existing	Other None	7 Approaches 0 Driveways 28.6120	Other (At-Grade) Multilane (2 Lane, unspecified)		All entries except Brigantine Blvd controled by stop signs. ICD estimated from Google Maps linework.
Frederick, MD Frederick Co. United States	Mercantile Dr. E / Rodes Cir. (39.39507, -77.44311)	Other Existing	Unknown Unknown	4 Approaches 0 Driveways 0.0000	Other (At-Grade) Single-Lane		No splitter islands.
El Jebel, CO Eagle Co. United States	El Jebel Rd. / Shadow Rock Rd. (39.39554, -107.08999)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 128.2910	Other (At-Grade) Single-Lane	2017	https://www.aspentimes.com/news/el-jebel-road-roundabout-opens-saturday/ ICD estimated from Google Maps linework.
New Market, MD Frederick Co. United States	Eaglehead Dr. / Tomahawk St. / Fallfish Ct. (39.39677, -77.30826)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 35.0520	Other (At-Grade) Multilane (2 Lane, unspecified)	2018	Year Completed estimated (2017-2018).
Linganore, MD Frederick Co. United States	Lake Linganore Blvd. / Eaglehead Dr. (39.39732, -77.31047)	Roundabout Existing	All-Way Yield Unknown	3 Approaches 1 Driveways 0.0000	Other (At-Grade) Single-Lane	2019	Year Completed estimated (2018-2022).
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
Silver Springs, NV Lyon Co. United States	US 50 / USA Pkwy. / Opal Ave. (39.40014, -119.26883)	Roundabout Existing	All-Way Yield Unknown	4 Approaches 0 Driveways 64.0080	Other (At-Grade) Multilane (3+ Lane)	2017	Consecutive double-left turns.
Liberty Township, OH Butler Co. United States	Yankee Rd. / Millikin Rd. (39.40022, -84.38541)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 34.1471	Other (At-Grade) Single-Lane	2018	ICD estimated from Google Maps linework.
Carbondale, CO Garfield Co. United States	CO-133 / Main St. (39.40113, -107.21968)	Roundabout Existing	All-Way Yield Rectangular Rapid Flashing Beacon (RRFB)	4 Approaches 0 Driveways 42.4526	Other (At-Grade) Multilane (2 Lane, unspecified)	2013	ICD estimated from Google Maps linework.
Reno, NV Washoe Co. United States	Herz Blvd. / Summit Sierra Blvd. (39.40118, -119.75215)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 45.7200	Other (At-Grade) Multilane (2 Lane, unspecified)	2006	Concentric circulatory roadway striping. Year Completed estimated (2004-2006).
Liberty Township, OH Butler Co. United States	Millikin Rd. / Maud Hughes Rd. (39.40153, -84.40943)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 39.6837	Other (At-Grade) Single-Lane	2013	ICD estimated from Google Maps linework.
Towson, MD Baltimore Co. United States	MD 45 / MD 146 / Joppa Rd. / Allegheny Ave. (39.40185, -76.60230)	Roundabout Existing	All-Way Yield None	5 Approaches 0 Driveways 47.9892	Other (At-Grade) Multilane (2 Lane, unspecified)	1998	Opened October 1998. Exit striping retrofitted to roundabout after opening. Hotdog/racetrack shape. ICD estimated from Google Maps linework. 21442
Linganore, MD Frederick Co. United States	Finn Dr. / Douglas Ave. / Huckleberry Way (39.40210, -77.29509)	Other Existing	Unknown Unknown	4 Approaches 0 Driveways 0.0000	Other (At-Grade) Single-Lane		Pedestrian access to central island. No splitter islands.
Martinsville, IN Morgan Co. United States	SR 39 / I-69 NB Ramps / Southview Dr. (39.40262, -86.44528)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 0.0000	Freeway Ramps (Grade-Separated) Single-Lane	2021	Year Completed estimated (2020-2021). https://i69finishline.com/construction-schedule/.
Liberty Township, OH Butler Co. United States	Millikin Rd. / Pinckney Trl. (39.40263, -84.43077)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 39.6240	Other (At-Grade) Single-Lane	2021
Reno, NV Washoe Co. United States	SR 341 (Geiger Grade Rd.) / Veterans Pkwy. / (parking) (39.40271, -119.74165)	Roundabout Existing	All-Way Yield Unknown	4 Approaches 0 Driveways 62.4840	Other (At-Grade) Multilane (2 Lane, unspecified)	2011	Double left (left, left-through-right) on south leg; double right (left-through-right, right) on west leg.
Perry Hall, MD Baltimore Co. United States	E Joppa Rd. / Scott Moore Way / Cowenton Ave. (39.40290, -76.44124)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 38.1000	Other (At-Grade) Single-Lane	2008	Right-turn bypass lane on west leg.
Townsend, DE New Castle Co. United States	Karins Circle (39.40433, -75.69677)	Other Existing	Unknown Unknown	4 Approaches 0 Driveways 0.0000	Other (At-Grade) Single-Lane
Martinsville, IN Morgan Co. United States	SR 39 (Morton Ave.) / I-69 SB Ramps / Rogers Rd. (39.40439, -86.44597)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 0.0000	Freeway Ramps (Grade-Separated) Multilane (2 Lane, unspecified)	2021	I-69 freeway opened 12/23/2021 - see https://content.govdelivery.com/accounts/INDOT/bulletins/30250b9 ** Roundabout opened with temporary configuration while new southbound ramp construction is completed
Perry Hall, MD Baltimore Co. United States	Georgia Belle Dr. / Fragrence Way / Harcrest Way (39.40467, -76.42700)	Other Existing	All-Way Yield Unknown	4 Approaches 4 Driveways 0.0000	Other (At-Grade) Single-Lane
Perry Hall, MD Baltimore Co. United States	Scott Moore Way / Honeygo Center Dr. (39.40491, -76.44142)	Other Existing	All-Way Yield Unknown	3 Approaches 1 Driveways 0.0000	Other (At-Grade) Single-Lane		Pedestrian access to central island.
White Marsh Station, MD Baltimore Co. United States	Carrington Dr. / Jerome Ave. (39.40574, -76.40236)	Other Existing	Unknown Unknown	4 Approaches 0 Driveways 0.0000	Other (At-Grade) Single-Lane		No splitter islands.
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).
Fairfield Township, OH Butler Co. United States	Millikin Rd. / Morris Rd. / Carter Cir. (39.40585, -84.49448)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 36.5760	Other (At-Grade) Single-Lane	2024	Roundabout opened August 3, 2024.
Frederick, MD Frederick Co. United States	S East St. / (future road) (39.40599, -77.40392)	Roundabout Existing	All-Way Yield None	2 Approaches 0 Driveways 51.8160	Other (At-Grade) Multilane (2 Lane, 2x1 max)	2009	Year Completed estimated (2009-2011). East leg is stubbed for future connection.
Frederick, MD Frederick Co. United States	Butterfly Ln. / Himes Ave. (39.40671, -77.44764)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 0.0000	Other (At-Grade) Unknown	2020	https://www.cityoffrederickmd.gov/CivicAlerts.aspx?aid=6432
Frederick, MD Frederick Co. United States	Briarcliff Ln. / Briarcliff Way / Cliffside Terrace (39.40696, -77.34925)	Other Existing	Unknown Unknown	4 Approaches 0 Driveways 0.0000	Other (At-Grade) Single-Lane		No splitter islands.
Rose, Calabria Cosenza Italy	SP234 / SP247 (39.40709, 16.26141)	Roundabout Existing	All-Way Yield Unknown	4 Approaches 0 Driveways	Other (At-Grade) Single-Lane
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.
Frederick, MD Frederick Co. United States	Claridge Dr. S / Spring Ridge Pkwy. (39.40767, -77.33577)	Roundabout Existing	All-Way Yield None	3 Approaches 2 Driveways 35.0520	Other (At-Grade) Single-Lane	2002	Painted splitter islands on two legs. Year Completed estimated (1988-2005).
Montalto Uffugo, Calabria Cosenza Italy	SP247 (Via Sila) / Via Coretta (39.40860, 16.25275)	Roundabout Existing	All-Way Yield Unknown	4 Approaches 0 Driveways	Other (At-Grade) Single-Lane
Casal da Boavista de São Gregório, Leiria Caldas da Rainha Portugal	Rua Doutor Vieira Pereira / Rua Inseparáveis De Lubango / Rua da Crocha (39.40878, -9.12190)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways	Other (At-Grade) Multilane (2 Lane, unspecified)
Townsend, DE New Castle Co. United States	Glen Mohr Dr. / Perthshire Dr. / S Odessa Blvd. (39.40908, -75.63633)	Other Existing	Unknown Unknown	3 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
Perry Hall, MD Baltimore Co. United States	Seven Courts Dr. / Proctor Ln. (39.41060, -76.48483)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 27.4320	Other (At-Grade) Single-Lane	2008	Year Completed estimated (2007-2008).
Joppa, MD Harford Co. United States	Trimble Rd. / Fort Hoyle Rd. (39.41183, -76.33325)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 30.4800	Other (At-Grade) Single-Lane	2012	Year Completed estimated (2011-2013).
Fort Bragg, CA Mendocino Co. United States	Hwy 1 / Simpson Ln. (39.41239, -123.80830)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 52.5958	Other (At-Grade) Single-Lane	2012	ICD estimated from Google Maps linework.
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.
Terre Haute, IN Vigo Co. United States	IN-46 / IN-641 NB Ramps (39.41253, -87.33459)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 36.9093	Freeway Ramps (Grade-Separated) Single-Lane	2016	ICD estimated from Google Maps linework.
Frederick, MD Frederick Co. United States	Hillsborough Dr. / Hillsborough Terrace / Forest Hills Ct. (39.41266, -77.34441)	Other Existing	Unknown Unknown	3 Approaches 0 Driveways 0.0000	Other (At-Grade) Single-Lane		No splitter islands.
Sykesville, MD Carroll Co. United States	Bennett Rd. / Monroe Ave. (39.41306, -76.92967)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 26.7590	Other (At-Grade) Single-Lane	2006	ICD estimated from Google Maps linework.
Castle Rock, CO Douglas Co. United States	New Beale St. / (parking) (39.41325, -104.87702)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 39.6240	Other (At-Grade) Single-Lane	2007	Year Completed estimated (2006-2008).
Liberty Township, OH Butler Co. United States	Kyles Station Rd. / Cincinnati Dayton Rd. (39.41390, -84.36743)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 40.5994	Other (At-Grade) Single-Lane	2016	ICD estimated from Google Maps linework.
Terre Haute, IN Vigo Co. United States	IN-46 / IN-641 SB Ramps (39.41463, -87.33553)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways	Freeway Ramps (Grade-Separated) Single-Lane	2016
Liberty Township, OH Butler Co. United States	Kyles Station Rd. / Yankee Rd. (39.41489, -84.38421)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 40.5988	Other (At-Grade) Single-Lane	2013	ICD estimated from Google Maps linework.
Townsend, DE New Castle Co. United States	Robinson Rd. / Goldsborough Dr. (39.41614, -75.65156)	Other Existing	Unknown Unknown	4 Approaches 0 Driveways 0.0000	Other (At-Grade) Single-Lane		No splitter islands on three legs.