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
Cagliari, Sardinia Cagliari Italy	Viale Poetto / Via Lungo Saline / Via Marina Piccola (39.19421, 9.15682)	Other Existing	Other Unknown	4 Approaches 0 Driveways	Other (At-Grade) Multilane (3+ Lane)		Mix of stop and yield control on entry.
Aspen, CO Pitkin Co. United States	SR 82 / Maroon Creek Rd. / Castle Creek Rd. (39.19557, -106.84025)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 60.9600	Other (At-Grade) Multilane (2 Lane, unspecified)	2000
Kansas City, MO Platte Co. United States	NW Waukomis Dr. / NW Englewood Rd. (39.19588, -94.60730)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 35.0520	Other (At-Grade) Single-Lane	2020
Kansas City, MO Platte Co. United States	NW 56th St. / N Northwood Rd. (39.19598, -94.63168)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 38.1000	Other (At-Grade) Single-Lane	2019
Hillsboro, VA Loudoun Co. United States	Charles Town Pike (Rte 9) / Hillsboro Rd. / (school access) (39.19806, -77.72000)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 0.0000	Other (At-Grade) Single-Lane	2021	https://www.washingtonpost.com/transportation/2021/07/23/virginia-hillsboro-walkable-roads-loudoun/
Carson City, NV Carson City Co. United States	Arrowhead Dr. / I-580 SB Ramp (39.19810, -119.77540)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 27.7669	Freeway Ramps (Grade-Separated) Single-Lane	2002	Future SB on-ramp for Carson City Freeway (I-580). Overpass and roundabouts completed in 2002; freeway ramps completed ~2005. ICD estimated from Google Maps linework.
Carson City, NV Carson City Co. United States	Arrowhead Dr. / I-580 NB Ramps / Imus Rd. (39.19840, -119.77380)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 28.6923	Freeway Ramps (Grade-Separated) Single-Lane	2002	NB off-ramp for Carson City Freeway (I-580) and extension of Imus Road. Overpass and roundabouts completed in 2002. ICD estimated from Google Maps linework.
Cagliari, Sardinia Cagliari Italy	Viale Salvatore Ferrara / Via Ramontana / Via Borgo Sant'Elia / Viale San Bartolomeo (39.19857, 9.14366)	Other Existing	All-Way Stop Unknown	4 Approaches 0 Driveways	Other (At-Grade) Multilane (2 Lane, 2x1 max)
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).
Hillsboro, VA Loudoun Co. United States	Charles Town Pike (Rte 9) / Stony Point Rd. (39.20016, -77.72763)	Roundabout Existing	All-Way Yield None	3 Approaches 1 Driveways 0.0000	Other (At-Grade) Single-Lane	2021	https://www.washingtonpost.com/transportation/2021/07/23/virginia-hillsboro-walkable-roads-loudoun/
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
Manhattan, KS Riley Co. United States	Kimball Ave. / Grand Mere Pkwy. (39.20168, -96.63786)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 32.3931	Other (At-Grade) Single-Lane	2000	Completed 3/2000. Built as part of new Colbert Hills Golf Course. Fatal crash January 31, 2010. 11861-05. Functional Class: Collector ICD estimated from Google Maps linework.
Cagliari, Sardinia Cagliari Italy	Viale Poetto / Via Campioni d'Italia 1969-70 / Via Amerigo Vespucci / Viale San Bartolomeo (39.20178, 9.14142)	Roundabout Existing	All-Way Yield Unknown	3 Approaches 0 Driveways	Unknown Multilane (2 Lane, 2x1 max)		Via Amerigo Vespucci is one-way entering; Viale San Bartolomeo is one-way exiting.
Winchester, VA Frederick Co. United States	Campus Blvd. / SR 37 SB Ramps (39.20215, -78.19348)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 41.1480	Freeway Ramps (Grade-Separated) Single-Lane	2015	Right-turn merging bypass lane on east leg. Truck apron much wider than circulatory roadway. Year Completed estimated (2013-2017).
Parkville, MO Platte Co. United States	N Nevada Ave. / Thousand Oaks Pl. (39.20318, -94.74726)	Other Existing	Unknown Unknown	4 Approaches 0 Driveways 0.0000	Other (At-Grade) Single-Lane
Germantown, MD Montgomery Co. United States	Crystal Rock Dr. / Century Blvd. (39.20326, -77.27356)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 48.7680	Other (At-Grade) Multilane (2 Lane, 2x2 max)	2015	Striping added 2019-2021. Inconsistent lane use markings between entry and circulatory roadway.
Germantown, MD Montgomery Co. United States	Milestone Manor Ln. / Emerald Dr. (39.20479, -77.25262)	Other Existing	Unknown Unknown	4 Approaches 0 Driveways 0.0000	Other (At-Grade) Unknown
Cagliari, Sardinia Cagliari Italy	Viale Armando Diaz / Via Campioni d'Italia 1969-70 / Via dei Salinieri / Via Generale Stefano Cagna / Via della Pineta (39.20491, 9.13802)	Roundabout Existing	All-Way Yield Unknown	5 Approaches 0 Driveways	Other (At-Grade) Multilane (2 Lane, 2x1 max)
Clarksville, MD Howard Co. United States	Brighton Dam Rd. / Ten Oaks Rd. (39.20491, -76.95455)	Roundabout Existing	Unknown Unknown	3 Approaches 0 Driveways 35.1680	Other (At-Grade) Single-Lane	2008	ICD estimated from Google Maps linework.
Germantown, MD Montgomery Co. United States	Milestone Manor Ln. / Royal Crown Dr. (39.20518, -77.25877)	Other Existing	Unknown Unknown	4 Approaches 0 Driveways 0.0000	Other (At-Grade) Unknown
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
Germantown, MD Montgomery Co. United States	Milestone Manor Ln. / Stardrift Dr. (39.20560, -77.25039)	Other Existing	Unknown Unknown	4 Approaches 0 Driveways 0.0000	Other (At-Grade) Unknown
Claycomo, MO Clay Co. United States	Ford Motor Plant No 4 Rd. / (parking) (39.20602, -94.47845)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 45.7200	Other (At-Grade) Multilane (2 Lane, unspecified)	2013	Year Completed estimated (2012-2013). Reconfiguration of factory entrance and parking circulation.
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.
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
Kansas City, MO Platte Co. United States	N Nevada Ave. / NW 62nd Pl. (39.20830, -94.74611)	Other Existing	Unknown Unknown	4 Approaches 0 Driveways 0.0000	Other (At-Grade) Single-Lane
Kansas City, MO Platte Co. United States	NW 62nd Terrace / NW Prairie View Rd. / N Chatham Ave. (39.20831, -94.64319)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 48.7680	Freeway Ramps (Grade-Separated) Single-Lane	2021	https://www.kcmo.gov/Home/Components/FacilityDirectory/FacilityDirectory/95/360
Columbus, IN Bartholomew Co. United States	11th St. / Lindsey St. / Brown St. (39.20836, -85.92443)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 44.4206	Other (At-Grade) Multilane (2 Lane, unspecified)	2008	At-grade rail crossing on west leg (flashers, no gates). 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.
Germantown, MD Montgomery Co. United States	Milestone Manor Ln. / Manor View Cir. / Milestone Manor Ct. (39.20854, -77.24868)	Other Existing	Unknown Unknown	4 Approaches 0 Driveways 0.0000	Other (At-Grade) Unknown
Elkridge, MD Howard Co. United States	Toomey Ln. / Clements Ln. (39.20950, -76.71291)	Other Existing	Unknown Unknown	2 Approaches 4 Driveways 0.0000	Other (At-Grade) Unknown		No splitter islands.
Columbia, MD Howard Co. United States	Trotter Rd. / South Wind Cir. (39.20956, -76.91891)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 23.1353	Other (At-Grade) Single-Lane	1997	Functional Class: Collector. Year Completed estimated (1993-2001). ICD estimated from Google Maps linework.
Kansas City, MO Platte Co. United States	Lewis St. / (parking access) (39.20966, -94.68484)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 21.2845	Other (At-Grade) Single-Lane	2005	ICD estimated from Google Maps linework.
Snowmass Village, CO Pitkin Co. United States	Wood Rd. / Carriage Way (39.21000, -106.94756)	Roundabout Existing	All-Way Yield Unknown	3 Approaches 0 Driveways 40.7179	Other (At-Grade) Single-lane w/ Traversable Central Island	2016	ICD estimated from Google Maps linework.
Parkville, MO Platte Co. United States	MO 45 (Tom Watson Pkwy.) / National Dr. (39.21016, -94.70027)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 48.1210	Other (At-Grade) Single-Lane	2000	Functional Class: Arterial ICD estimated from Google Maps linework.
Snowmass Village, CO Pitkin Co. United States	Brush Creek Rd. / Wood Rd. / Kearns Rd. (39.21053, -106.94725)	Roundabout Existing	All-Way Yield Unknown	4 Approaches 0 Driveways 27.7620	Other (At-Grade) Single-Lane	2016	Right-turn bypass lane on south leg. ICD estimated from Google Maps linework.
Elkridge, MD Howard Co. United States	Toomey Ln. / Fairlee Rd. (39.21083, -76.71160)	Roundabout Existing	All-Way Yield None	3 Approaches 2 Driveways 27.4320	Other (At-Grade) Single-Lane	2002
Manhattan, KS Riley Co. United States	Gary Ave. / Candlewood Dr. (39.21087, -96.61885)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 21.2841	Other (At-Grade) Single-Lane	1997	Considered to be the First Modern Roundabout in the State of Kansas. Previously controlled by two-way stop Functional Class: Collector ICD estimated from Google Maps linework.
Elkridge, MD Howard Co. United States	Elkridge Crossing Way / Doctor Patel Dr. (39.21091, -76.72512)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 31.4634	Other (At-Grade) Single-Lane	2007	East leg stubbed for future. ICD estimated from Google Maps linework.
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.
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.
Columbia, MD Howard Co. United States	Charter Dr. / (parking) (39.21273, -76.88310)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 27.4320	Other (At-Grade) Single-Lane	2013	Converted from cul-de-sac. Year Completed estimated (2011-2014).
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).
Parkville, MO Platte Co. United States	National Dr. / Ridge Rd. (39.21333, -94.70781)	Other Existing	Unknown Unknown	3 Approaches 0 Driveways 49.9696	Other (At-Grade) Single-Lane		Functional Class: Local ICD estimated from Google Maps linework.
Gladstone, MO Clay Co. United States	NE Antioch Rd. / NE Pleasant Valley Rd. (39.21369, -94.53468)	Roundabout Existing	All-Way Yield Unknown	3 Approaches 0 Driveways 34.2382	Other (At-Grade) Single-Lane	2018	https://www.linecreekloudmouth.com/blog/street-improvements/ ICD estimated from Google Maps linework.
Clarksburg, MD Montgomery Co. United States	Clarksburg Rd. / W Old Baltimore Rd. (39.21396, -77.29731)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 42.6720	Other (At-Grade) Single-Lane	2019	Year Completed estimated (2019-2020).
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.
Columbia, MD Howard Co. United States	Harpers Farm Rd. / Campus Dr. (39.21534, -76.88023)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 31.4614	Other (At-Grade) Single-Lane	2003	Originally had 4 legs. ICD estimated from Google Maps linework.
Sycamore Township, OH Hamilton Co. United States	Plainfield Rd. / Sycamore Rd. (39.21534, -84.39192)	Roundabout Existing	All-Way Yield Unknown	3 Approaches 0 Driveways 37.9388	Other (At-Grade) Single-Lane	2019	ICD estimated from Google Maps linework.
Clarksville, MD Howard Co. United States	Highland Rd. / Triadelphia Mill Rd. (39.21551, -76.97698)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 36.5760	Other (At-Grade) Single-Lane	2008
Cagliari, Sardinia Cagliari Italy	Via Lungo Saline / Via dell'Idrovora (39.21551, 9.17084)	Roundabout Existing	All-Way Yield Unknown	3 Approaches 0 Driveways	Other (At-Grade) Multilane (2 Lane, 2x1 max)
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.
Clarksburg, MD Montgomery Co. United States	Broadway Ave. / Little Seneca Pkwy. (39.21646, -77.28540)	Roundabout Existing	All-Way Yield Unknown	3 Approaches 0 Driveways 45.7200	Other (At-Grade) Multilane (2 Lane, 2x2 max)	2016	Year Completed estimated (2015-2017). Striping added 2019-2021.
Clarksburg, MD Montgomery Co. United States	Little Seneca Pkwy. / Cabin Branch Ave. (39.21654, -77.28310)	Roundabout Existing	All-Way Yield Unknown	4 Approaches 0 Driveways 45.7200	Other (At-Grade) Multilane (2 Lane, 2x2 max)	2016	Year Completed estimated (2016-2017). Striping added 2019-2021.
Kansas City, MO Platte Co. United States	NW Union Chapel Rd. / NW Brink-Meyer Rd. (39.21830, -94.73579)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 28.6842	Other (At-Grade) Single-Lane	2011	ICD estimated from Google Maps linework.
Chestertown, MD Kent Co. United States	MD 20 / MD 291 / (parking lot) (39.21863, -76.07913)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 47.1899	Other (At-Grade) Single-Lane	2015	ICD estimated from Google Maps linework.
Kansas City, MO Platte Co. United States	MO-45 (Tom Watson Pkwy.) / NW Union Chapel Rd. (MO K) (39.21999, -94.73524)	Roundabout Existing	All-Way Yield Unknown	4 Approaches 0 Driveways 55.5165	Other (At-Grade) Multilane (2 Lane, unspecified)	2010	ICD estimated from Google Maps linework.
Clarksburg, MD Montgomery Co. United States	Cabin Branch Ave. / Skimmer St. (39.22020, -77.28435)	Roundabout Existing	All-Way Yield Unknown	4 Approaches 0 Driveways 45.7200	Other (At-Grade) Multilane (2 Lane, 2x2 max)	2016	Year Completed estimated (2015-2017). Striping added 2019-2021.
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
Grass Valley, CA Nevada Co. United States	E. Main St. / Idaho-Maryland Rd. / SR 20 WB Ramps (39.22168, -121.05380)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 39.6240	Freeway Ramps (Grade-Separated) Multilane (2 Lane, unspecified)	2008	Yield-controlled right-turn bypass lane on north leg with very shallow angle. Left-turn-only lane on east leg.
Kansas City, MO Clay Co. United States	Searcy Creek Pkwy. / NE Shoal Creek Pkwy. (39.22229, -94.50338)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 77.7240	Other (At-Grade) Multilane (2 Lane, unspecified)	2008
Liberty, MO Clay Co. United States	Liberty Dr / Flintrock Rd (39.22231, -94.46337)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 40.7108	Other (At-Grade) Single-Lane	2013	ICD estimated from Google Maps linework.
Stephenson, VA Frederick Co. United States	Northumberland Dr. / Churndash Way / Patchwork Dr. (39.22289, -78.09317)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 36.5760	Other (At-Grade) Single-Lane	2017	No pavement markings or splitter islands as of October 2017.
Montgomery, OH Hamilton Co. United States	US 22 (Montgomery Rd.) / SR 126 (Ronald Reagan Cross Country Hwy.) (39.22308, -84.35643)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 0.0000	Other (At-Grade) Multilane (3+ Lane)	2021	Previously a grade-separated freeway interchange. https://m.facebook.com/CityofMontgomeryOhio/videos/352303629903240/
Quartu Sant’Elena, Sardinia Cagliari Italy	Viale Lungomare del Golfo / Viale Cristoforo Colombo / (parking) (39.22372, 9.19555)	Roundabout Existing	All-Way Yield Unknown	3 Approaches 1 Driveways	Other (At-Grade) Multilane (2 Lane, 2x1 max)
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
Kansas City, MO Platte Co. United States	NW 72nd St. / N Overland Dr. (39.22495, -94.64044)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 0.0000	Other (At-Grade) Single-Lane	2020	https://www.kcmo.gov/Home/Components/FacilityDirectory/FacilityDirectory/53/360?npage=2
Kansas City, MO Platte Co. United States	NW 72nd St. / NW Waukomis Dr. / N Green Hills Rd. (39.22505, -94.62750)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 34.2327	Other (At-Grade) Single-Lane	2012	Streetview car went through just after completion while two approaches were still blocked off. ICD estimated from Google Maps linework.
Kansas City, MO Platte Co. United States	MO-45 (Tom Watson Pkwy.) / NW Brink-Myer Rd. (39.22507, -94.75656)	Roundabout Existing	All-Way Yield Unknown	3 Approaches 0 Driveways 45.3352	Other (At-Grade) Multilane (2 Lane, unspecified)	2017	ICD estimated from Google Maps linework.
Snowmass Village, CO Pitkin Co. United States	Brush Creek Rd. / Highline Rd. (39.22541, -106.92049)	Roundabout Existing	All-Way Yield None	3 Approaches 1 Driveways 38.1000	Other (At-Grade) Single-Lane	2006
Blue Ash, OH Hamilton Co. United States	Hunt Rd. / (parking) (39.22578, -84.39828)	Roundabout Existing	All-Way Yield Rectangular Rapid Flashing Beacon (RRFB)	3 Approaches 0 Driveways 36.5760	Other (At-Grade) Single-Lane	2022	Opened February 2, 2022. https://www.blueash.com/departments/public_works/hunt_plainfield.php
Clarksburg, MD Montgomery Co. United States	Snowden Farm Pkwy. / Winding Woods Way (39.22604, -77.24727)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 40.7086	Other (At-Grade) Multilane (2 Lane, unspecified)	2012	Year Completed estimated (2011-2013). ICD estimated from Google Maps linework.
Clarksville, MD Howard Co. United States	Running Fence Ln. / Preakness Circle Ln. (39.22640, -76.94374)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 30.4800	Other (At-Grade) Single-Lane	2010
Clarksburg, MD Montgomery Co. United States	Clarksburg Rd. (MD 121) / Cabin Branch Ave. (39.22689, -77.29051)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 46.2592	Other (At-Grade) Multilane (2 Lane, unspecified)	2015	ICD estimated from Google Maps linework.
Blue Ash, OH Hamilton Co. United States	Hunt Rd. / Plainfield Rd. (39.22691, -84.39426)	Roundabout Existing	All-Way Yield Rectangular Rapid Flashing Beacon (RRFB)	4 Approaches 0 Driveways 53.0352	Other (At-Grade) Multilane (2 Lane, 2x2 max)	2023	https://www.wcpo.com/news/local-news/hamilton-county/blue-ash/blue-ash-police-new-roundabout-while-confusing-some-is-reducing-crashes
Clarksburg, MD Montgomery Co. United States	Clarksburg Rd. (MD 121) / (outlet mall entrance) (39.22844, -77.28869)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 49.9588	Other (At-Grade) Multilane (2 Lane, unspecified)	2015	ICD estimated from Google Maps linework.
Clarksville, MD Howard Co. United States	Preakness Circle Ln. / Watkins Bridge Ln. (39.22880, -76.94308)	Roundabout Existing	All-Way Yield None	3 Approaches 1 Driveways 30.4800	Other (At-Grade) Single-Lane	2010
Clarksville, MD Howard Co. United States	Watkins Bridge Ln. / Holly Creek Ln. (39.22939, -76.94583)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 30.4800	Other (At-Grade) Single-Lane	2010
Clarksville, MD Howard Co. United States	Linden Church Rd. / MD 32 NB Ramps (39.22942, -76.97263)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 39.6240	Freeway Ramps (Grade-Separated) Single-Lane	2013	Year Completed estimated (2011-2014).
Clarksburg, MD Montgomery Co. United States	Little Seneca Pkwy. / Snowden Farm Pkwy. (39.22989, -77.25280)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 28.6795	Other (At-Grade) Multilane (2 Lane, unspecified)	2012	Year Completed estimated (2011-2013). ICD estimated from Google Maps linework.
Quartu Sant’Elena, Sardinia Cagliari Italy	SP17 / SP17ter / Viale Europa / Via Flume (39.23079, 9.22086)	Roundabout Existing	All-Way Yield Unknown	4 Approaches 0 Driveways	Other (At-Grade) Multilane (2 Lane, 2x2 max)
Blue Ash, OH Hamilton Co. United States	Plainfield Rd. / Peppermill Ln. / Reed-Hartman Hwy. (39.23083, -84.39482)	Roundabout Existing	All-Way Yield Rectangular Rapid Flashing Beacon (RRFB)	4 Approaches 0 Driveways 0.0000	Other (At-Grade) Multilane (2 Lane, 2x1 max)	2023	RRFB on all four legs. https://www.blueash.com/departments/public_works/hunt_plainfield.php
Kansas City, MO Clay Co. United States	NE Flintlock Rd / NE 76th St (39.23094, -94.47007)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 57.3581	Other (At-Grade) Multilane (2 Lane, unspecified)	2013	ICD estimated from Google Maps linework.
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.
Clarksville, MD Howard Co. United States	Northern Bell Way / Bee Frances Way / Catherine Close Rd. (39.23232, -76.97091)	Other Existing	Unknown Unknown	3 Approaches 1 Driveways 0.0000	Other (At-Grade) Single-Lane
Grass Valley, CA Nevada Co. United States	Olympia Park Cir. / (parking lot) (39.23248, -121.03766)	Roundabout Existing	All-Way Yield None	2 Approaches 1 Driveways 22.8600	Other (At-Grade) Single-lane w/ Traversable Central Island	2014	All paint, no raised islands. Opened November 2014. Previously, Olympia Park Circle made a gentle 90-degree curve. Traffic entering from stop-controlled driveway had trouble making left turn as they had to proceed 60 feet to reach the safety of centerline without knowing if approaching vehicle on their left was going to enter the driveway or curve left in front of them. Now about 50% of driveway exits cheat across the central island, but it works just fine. After six years with no raised islands, a central island was built on 3 Nov 2020: 20 feet in diameter, 4 inches high, designed for asphalt but built with PCC.
Grass Valley, CA Nevada Co. United States	Sierra College Dr. / Litton Dr. / Robert Ross Way (39.23445, -121.05200)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 32.3780	Other (At-Grade) Single-Lane	2003	ICD estimated from Google Maps linework.
Kings Beach, CA Placer Co. United States	N Lake Blvd. / Coon St. (39.23589, -120.02207)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 29.6021	Other (At-Grade) Single-Lane	2014	ICD estimated from Google Maps linework.
Clarksburg, MD Montgomery Co. United States	Saint Clair Rd. / Timber Creek Ln. / Brewers Tavern Terrace / (unknown) (39.23680, -77.27531)	Other Existing	Unknown Unknown	5 Approaches 0 Driveways 0.0000	Other (At-Grade) Single-Lane		No splitter islands.
Kings Beach, CA Placer Co. United States	N Lake Blvd. / Bear Ave. / Brook Ave. / (beach parking) (39.23681, -120.02465)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 24.0514	Other (At-Grade) Single-Lane	2014	ICD estimated from Google Maps linework.
Blue Ash, OH Hamilton Co. United States	Malsbary Rd. / Alliance Rd. (39.23916, -84.38188)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 34.2258	Other (At-Grade) Single-Lane	2017	http://www.blueash.com/departments/public_works/roundabout_safety.php ICD estimated from Google Maps linework.
Clarksburg, MD Montgomery Co. United States	Granite Rock Rd. / Grand Elm St. (39.24126, -77.26647)	Other Existing	Unknown Unknown	4 Approaches 0 Driveways 0.0000	Other (At-Grade) Single-Lane		No splitter islands.
Cagliari, Sardinia Cagliari Italy	Via Edward Jenner / (connector to SS131dir) (39.24238, 9.11694)	Other Existing	All-Way Stop Unknown	3 Approaches 0 Driveways	Other (At-Grade) Multilane (2 Lane, unspecified)
Kansas City, MO Clay Co. United States	NE 82nd Terr. / N Booth Ave. (39.24250, -94.47752)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 53.3400	Other (At-Grade) Multilane (2 Lane, unspecified)	2008	South leg stubbed.
Blue Ash, OH Hamilton Co. United States	Plainfield Rd. / Parkview Dr. (39.24335, -84.39561)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 18.4993	Other (At-Grade) Single-Lane	2018	http://www.blueash.com/departments/public_works/roundabout_safety.php ICD estimated from Google Maps linework.
Liberty, MO Clay Co. United States	S Stewart Rd. / (parking) (39.24344, -94.45337)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 33.5277	Other (At-Grade) Single-Lane	2016	Add-lane right-turn bypass lane on south leg.
Dundalk, MD Baltimore Co. United States	Dundalk Ave. / Sollers Point Rd. (39.24534, -76.50786)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 24.9734	Other (At-Grade) Single-Lane	2007	ICD estimated from Google Maps linework.
West Friendship, MD Howard Co. United States	Castlebridge Rd. / Hunter's View Rd. (39.24552, -76.90189)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 42.6720	Other (At-Grade) Single-Lane	2006
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
Kansas City, MO Clay Co. United States	N Booth Ave. / NE Shoal Creek Valley Dr. / Commercial Dr. (39.24626, -94.47674)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 44.1960	Other (At-Grade) Multilane (2 Lane, 2x1 max)	2020	Yield-controlled right-turn bypass lane on west leg. Year Completed estimated (2020-20210.