Roundabouts Database Index

30641 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
Montrose, CO Montrose Co. United States	E Oak Grove Rd. / Woodgate Rd. (38.45996, -107.86403)	Roundabout Existing	All-Way Yield Unknown	4 Approaches 0 Driveways 41.1480	Other (At-Grade) Multilane (2 Lane, 2x1 max)	2025	Left-turn-only lane on east leg. Yield-controlled right-turn bypass lane on south leg. https://www.facebook.com/cityofmontroseco/posts/new-roundabout-at-woodgate-and-east-oak-grove-is-open-the-city-of-montrose-is-pl/1237823605053788/
Jackson, GA Butts Co. United States	US 23-GA 16 (W 3rd St.) / US 23 (Brookwood Ave.) / GA 16 (W 3rd St.) (33.29422, -83.97431)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 27.4320	Other (At-Grade) Single-Lane	2025	https://www.dot.ga.gov/applications/geopi/Pages/Dashboard.aspx?ProjectID=0015425.
Houston, TX Harris Co. United States	Navigation Blvd. / Jensen Dr. / Runnels St. (29.75927, -95.34579)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 48.7680	Other (At-Grade) Multilane (2 Lane, 2x2 max)	2024	Double-left-turn movement on southeast leg.
Hill City, MN Aitkin Co. United States	US 169 / STH 200 (46.98658, -93.60475)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 0.0000	Other (At-Grade) Single-Lane	2025	https://www.dot.state.mn.us/news/2025/05/27-d1-hwy200.html
Gonzales, LA Ascension Par. United States	Church Point Rd. / Roddy Rd. (30.24006, -90.90380)	Roundabout Existing	All-Way Yield Unknown	4 Approaches 0 Driveways 39.6240	Other (At-Grade) Single-Lane	2024
Gardnerville, NV Douglas Co. United States	Toler Ln. / Muller Pkwy. / Decker Rd. (38.93953, -119.72862)	Roundabout Existing	All-Way Yield Unknown	4 Approaches 0 Driveways 39.6240	Other (At-Grade) Single-Lane	2025	https://www.douglascountynv.gov/news/what_s_new/toler_lane_roundabout_construction.
Gardnerville, NV Douglas Co. United States	Buckeye Rd. / Muller Pkwy. (38.96130, -119.73837)	Roundabout Existing	All-Way Yield Unknown	4 Approaches 0 Driveways 54.8640	Other (At-Grade) Multilane (2 Lane, 2x1 max)	2025	https://www.recordcourier.com/news/2025/jul/09/muller-lane-parkway-work-will-close-buckeye-road-next-week/.
Covington, GA Newton Co. United States	Brown Bridge Rd. / Magnet Rd. (33.55415, -84.00785)	Roundabout Existing	All-Way Yield Unknown	4 Approaches 0 Driveways 47.2440	Other (At-Grade) Single-Lane	2024	Elliptical shaped. ICD = 155 ft x 145 ft. https://www.facebook.com/GDOTEast/videos/crews-are-preparing-to-detour-magnet-road-at-brown-bridge-road-in-newton-countya/1573496266567977/
Braselton, GA Jackson Co. United States	GA 53 / New Cut Rd. / Ednaville Rd. (34.13223, -83.76743)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 50.2920	Other (At-Grade) Single-Lane	2024	Elliptical shaped. ICD = 165 ft x 135 ft. https://www.facebook.com/Braselton411/posts/the-roundabout-at-hwy-53-new-cut-roadednaville-road-has-been-operational-for-jus/853349783584952/.
Henderson, NV Clark Co. United States	E Paradise Hills Dr. / Greenway Rd. (35.99086, -114.97674)	Roundabout Existing	All-Way Yield Unknown	4 Approaches 0 Driveways 36.5760	Other (At-Grade) Single-Lane	2021	Year Completed estimated (2021-2022).
Henderson, NV Clark Co. United States	Greenway Rd. / Heather Dr. (36.00537, -114.97668)	Roundabout Existing	All-Way Yield Unknown	4 Approaches 0 Driveways 27.4320	Other (At-Grade) Single-Lane	2021	Yield-controlled right-turn bypass lane on south leg. Year Completed estimated (2021-2022).
Henderson, NV Clark Co. United States	Greenway Rd. / E Middleton Dr. / Onyx Mountain Dr. (36.01882, -114.97610)	Roundabout Existing	All-Way Yield Unknown	4 Approaches 0 Driveways 54.8640	Other (At-Grade) Multilane (2 Lane, 2x1 max)	2021	Year Completed estimated (2021-2022).
Henderson, NV Clark Co. United States	Paradise Hills Dr. / Nevada State Dr. (35.98365, -114.93505)	Roundabout Existing	All-Way Yield Unknown	4 Approaches 0 Driveways 54.8640	Other (At-Grade) Multilane (2 Lane, 2x2 max)	2021	Year Completed estimated (2021-2022).
(unincorporated), NC Rowan Co. United States	Old Salisbury-Concord Rd. / Irish Potato Rd. (35.50306, -80.54390)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 0.0000	Other (At-Grade) Single-Lane	2024	On border between Cabarrus County and Rowan County. https://www.kannapolisnc.gov/news/ID/30/Cabarrus-County-Roundabout-Construction-Starts-Next-Week.
Toms River, NJ Ocean Co. United States	W College Dr. / N College Dr. (40.00760, -74.17067)	Rotary Existing	All-Way Yield Unknown	4 Approaches 0 Driveways 88.3920	Other (At-Grade) Single-Lane		Elliptical shaped. ICD = 290 ft x 250 ft.
Brick, NJ Ocean Co. United States	Acapulco Dr. / W Briarcliff Dr. / E Briarcliff Dr. (40.04476, -74.09687)	Other Existing	Uncontrolled Unknown	4 Approaches 0 Driveways 0.0000	Other (At-Grade) Single-Lane		No splitter islands.
Trenton, NJ Mercer Co. United States	Newtown Blvd. / Lake Dr. (40.22339, -74.62862)	Other Existing	One-Way/Two-Way Stop Unknown	4 Approaches 0 Driveways 0.0000	Other (At-Grade) Single-Lane
Westampton, NJ Burlington Co. United States	Irick Rd. / (unknown) (40.03028, -74.82283)	Roundabout Existing	All-Way Yield Unknown	4 Approaches 0 Driveways 42.6720	Other (At-Grade) Single-Lane	2025
Cinnaminson, NJ Burlington Co. United States	Harbor Blvd. / Camelot Ct. (40.01780, -75.00059)	Unknown Existing	Unknown Unknown	3 Approaches 0 Driveways 39.9998	Other (At-Grade) Single-Lane
Cinnaminson, NJ Burlington Co. United States	Harbor Blvd. / Nathan Dr. (40.01933, -75.00208)	Unknown Existing	Unknown Unknown	4 Approaches 0 Driveways 39.6240	Other (At-Grade) Single-Lane
Palmyra, NJ Burlington Co. United States	Harbour Dr. / Riverfront Dr. / Lakeside Dr. (40.00910, -75.03418)	Other Existing	Unknown Unknown	4 Approaches 0 Driveways 70.1040	Other (At-Grade) Single-Lane
Moorestown, NJ Burlington Co. United States	Laurel Creek Blvd. / Oakmont Dr. (39.99317, -74.90294)	Other Existing	All-Way Yield Unknown	4 Approaches 0 Driveways 0.0000	Other (At-Grade) Single-Lane		No splitter islands.
Moorestown, NJ Burlington Co. United States	Hazeltime Circle: Sarazen Dr. / Tournament Dr. (39.98666, -74.89670)	Other Existing	Unknown Unknown	3 Approaches 10 Driveways 70.1040	Other (At-Grade) Single-Lane		Pedestrian access to central island. No splitter islands.
Moorestown, NJ Burlington Co. United States	Laurel Creek Blvd. / Troon Ct. (39.99753, -74.89022)	Other Existing	Unknown Unknown	3 Approaches 0 Driveways 0.0000	Other (At-Grade) Single-Lane		No splitter islands.
Delanco, NJ Burlington Co. United States	Newtons Landing Blvd. / Russ Farm Way / Pennington Ct. (40.04379, -74.94370)	Other Existing	Unknown Unknown	3 Approaches 0 Driveways 0.0000	Other (At-Grade) Single-Lane		No splitter islands on two legs.
Bridgeboro, NJ Burlington Co. United States	Russ Farm Way / Shipps Way (40.04530, -74.94627)	Other Existing	Unknown Unknown	2 Approaches 0 Driveways 47.9999	Other (At-Grade) Single-Lane		No splitter islands.
Sicklerville, NJ Camden Co. United States	Jefferson Dr. / Wilson Dr. (39.78690, -75.04044)	Roundabout Existing	All-Way Yield Unknown	3 Approaches 0 Driveways 30.4800	Other (At-Grade) Single-Lane	2011	Year Completed estimated (2010-2011).
Rochester, MN Olmsted Co. United States	1st Ave. SE / 6th St. SE (44.01687, -92.46105)	Roundabout Existing	All-Way Yield None	4 Approaches 1 Driveways 32.0037	Other (At-Grade) Single-lane w/ Traversable Central Island	2025	Compact roundabout serves as the turnaround for the bus rapid transit route, with one-way eastbound and westbound grade separated cycle tracks on the north and south legs.
Vail, CO Eagle Co. United States	Chamonix Rd. / I-70 WB Ramps / North Frontage Rd. (39.62828, -106.42120)	Roundabout Existing	All-Way Yield None	5 Approaches 0 Driveways 45.7200	Freeway Ramps (Grade-Separated) Multilane (2 Lane, 2x2 max)	1997
Vail, CO Eagle Co. United States	Chamonix Rd. / I-70 EB Ramps / South Frontage Rd. (39.62753, -106.42020)	Roundabout Existing	All-Way Yield None	5 Approaches 0 Driveways 45.7200	Freeway Ramps (Grade-Separated) Multilane (2 Lane, 2x1 max)	1997
Avon, CO Eagle Co. United States	Avon Rd. / I-70 WB Ramps (39.63782, -106.52080)	Roundabout Existing	All-Way Yield Active Pedestrian Warning (flashing yellow)	3 Approaches 0 Driveways 42.6720	Freeway Ramps (Grade-Separated) Multilane (2 Lane, 2x2 max)	1997	Highway ref. pt. 70-166.62. Raindrop shaped.
Avon, CO Eagle Co. United States	Avon Rd. / I-70 EB Ramps (39.63683, -106.52170)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 44.1960	Freeway Ramps (Grade-Separated) Multilane (2 Lane, 2x2 max)	1997	Highway ref. pt. 70-166.62. Raindrop shaped.
De Pere, WI Brown Co. United States	Scheuring Rd. (CTH F) / US 41 NB Ramps (44.43074, -88.10989)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 53.3400	Freeway Ramps (Grade-Separated) Multilane (2 Lane, 2x1 max)	2011	Series of 6 roundabouts. Yield-controlled right-turn bypass lane on south leg; merging right-turn bypass lane on east leg. Opened September 2011. Circular central island.
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
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
De Pere, WI Brown Co. United States	Scheuring Rd. (CTH F) / US 41 SB Ramps (44.43050, -88.11402)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 56.3880	Freeway Ramps (Grade-Separated) Multilane (2 Lane, 2x2 max)	2011	Series of 6 roundabouts. Opened September 2011.
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.
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.
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.
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
Topeka, KS Shawnee Co. United States	Rice Rd. / I-70 WB Ramps / Sycamore Dr. (39.03610, -95.62310)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 44.5293	Freeway Ramps (Grade-Separated) Single-Lane	2000	Part of a major realignment of I-70 and K-4. Sycamore Drive is one way with two westbound lanes (into the roundabout). Partial cloverleaf AB interchange type. Completed October 2000. ICD estimated from Google Maps linework.
Topeka, KS Shawnee Co. United States	Rice Rd. / I-70 EB Ramps / Cyprus Drive (39.03190, -95.62320)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 52.8817	Freeway Ramps (Grade-Separated) Single-Lane	2000	Part of a major realignment of I-70 and K-4. Cyprus Drive is One Way Eastbound (away from the roundabout). Partial cloverleaf AB interchange type. Completed October 2000. ICD estimated from Google Maps linework.
Green Bay, WI Brown Co. United States	W. Mason St. (STH 32-STH 54) / US 41 SB Ramps (44.52418, -88.08284)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 45.9811	Freeway Ramps (Grade-Separated) Multilane (3+ Lane)	2012	Series of 3 roundabouts. Opened August 31, 2012. ICD estimated from Google Maps linework.
Green Bay, WI Brown Co. United States	W. Mason St. (STH 32-STH 54) / US 41 NB Ramps (44.52415, -88.08103)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 43.4266	Freeway Ramps (Grade-Separated) Multilane (3+ Lane)	2012	Series of 3 roundabouts. Opened August 31, 2012. ICD estimated from Google Maps linework.
Arcata, CA Humboldt Co. United States	Guintoli Ln. / US 101 SB Ramps (40.90400, -124.08920)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 39.7180	Freeway Ramps (Grade-Separated) Single-Lane	2005	ICD estimated from Google Maps linework.
Arcata, CA Humboldt Co. United States	Guintoli Ln. / US 101 NB Ramps (40.90492, -124.08510)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 34.3015	Freeway Ramps (Grade-Separated) Single-Lane	2005	ICD estimated from Google Maps linework.
Kingston, NY Ulster Co. United States	I-587 / Rte 28 / I-87 Ramps / Washington Ave. (41.94362, -74.02840)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 60.9600	Freeway Ramps (Grade-Separated) Multilane (2 Lane, 2x2 max)	2000	A 600 ft diameter traffic circle was replaced by 200 ft diameter roundabout. At Exit 19 from I-87. I-587 terminates in roundabout.
Anchorage, AK Anchorage United States	C St. / O'Malley EB Ramps (61.12273, -149.88630)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 53.3400	Freeway Ramps (Grade-Separated) Multilane (2 Lane, 2x1 max)	2006
Newton, KS Harvey Co. United States	Broadway St. / I-135 Ramps (38.05000, -97.32250)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 45.1441	Freeway Ramps (Grade-Separated) Single-Lane	2003	Single-point interchange. Near roundabout interchange at I-135/1st Street. Roundabout completed January 2002, ramps from I-135 to the roundabout reopened March 2002. Eliptical structure incorporating both NB and SB ramps. Previously controlled by one-way stop ICD estimated from Google Maps linework.
Topeka, KS Shawnee Co. United States	46th St. / US 75 Ramps (39.12934, -95.71959)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 124.9680	Freeway Ramps (Grade-Separated) Single-Lane	2002	Roundabout under structure as part of single-point interchange. Elliptical shaped. ICD = 410 ft x 270 ft. Original intersection was at grade. Completed November 2002.
Anchorage, AK Anchorage United States	Dowling Rd. / New Seward Hwy SB Ramps (61.16636, -149.85780)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 65.5320	Freeway Ramps (Grade-Separated) Multilane (2 Lane, 2x2 max)	2004	Roundabout revised in 2022-2023.
Anchorage, AK Anchorage United States	Dowling Rd. / New Seward Hwy NB Ramps (61.16637, -149.85520)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 57.9120	Freeway Ramps (Grade-Separated) Multilane (2 Lane, 2x2 max)	2004	Spiral striping. Roundabout revised 2022-2023.
Lewisville, NC Forsyth Co. United States	Concord Church Rd. / US 421 SB Ramp / Williams Rd. (36.08978, -80.43072)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 29.9191	Freeway Ramps (Grade-Separated) Single-Lane	2000	Solved capacity problem. Previously controlled by one-way stop ICD estimated from Google Maps linework.
St. George, UT Washington Co. United States	E. Brigham Rd. / I-15 NB Ramps (37.05939, -113.58350)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 42.8889	Freeway Ramps (Grade-Separated) Single-Lane	2006	Raindrop-shaped interchange terminal. ICD estimated from Google Maps linework.
Scaggsville, MD Howard Co. United States	MD 216 / US 29 SB Ramps (39.14562, -76.90418)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 53.7228	Freeway Ramps (Grade-Separated) Multilane (2 Lane, unspecified)	2001	Series of 4 roundabouts. ICD estimated from Google Maps linework.
Scaggsville, MD Howard Co. United States	MD 216 / US 29 NB Ramps / Ice Crystal Dr. (39.14476, -76.89799)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 70.1040	Freeway Ramps (Grade-Separated) Multilane (2 Lane, 2x1 max)	2001	Series of 4 roundabouts.
Millington, MD Kent Co. United States	MD 291 / US 301 SB Ramps (39.26463, -75.86641)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 31.4393	Freeway Ramps (Grade-Separated) Single-Lane	1999	Opened August 1999. ICD estimated from Google Maps linework.
Millington, MD Kent Co. United States	MD 291 / US 301 NB Ramps (39.26386, -75.86260)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 28.6656	Freeway Ramps (Grade-Separated) Single-Lane	1999	Opened August 1999. ICD estimated from Google Maps linework.
Gig Harbor, WA Pierce Co. United States	Borgen Blvd. / SR 16 NB Ramps / Burnham Dr. (47.35843, -122.61260)	Roundabout Existing	All-Way Yield None	6 Approaches 0 Driveways 47.7339	Freeway Ramps (Grade-Separated) Multilane (2 Lane, unspecified)	2001	Oval shaped central island. 6 legged configuration includes a on-ramp (outbound)leg. Central island is used as a roadway storm detention pond. Completed Summer/Fall 2001. Previously controlled by one-way stop ICD estimated from Google Maps linework.
Richland, WA Benton Co. United States	Steptoe Dr. / SR 240 EB Ramps / Columbia Park Trl. (46.23893, -119.24546)	Roundabout Existing	All-Way Yield Metering Signal	5 Approaches 0 Driveways 49.5635	Freeway Ramps (Grade-Separated) Multilane (2 Lane, unspecified)	2007	5th leg is on-ramp to SR 240. Opened November 2007. Lane configuration reduced in 2016. Modified in 2018 to add metering signal. According to local news (link below) they started metering the traffic on the westbound Columbia Park Trail approach in 2018. It only turns on when traffic coming off the freeway gets backed up. https://97rockonline.com/tri-cities-roundabout-gets-new-metered-traffic-light-wait-what/ 21442
St. George, UT Washington Co. United States	E. Brigham Rd. / I-15 SB Ramps / Pioneer Rd. (37.05999, -113.58560)	Roundabout Existing	All-Way Yield None	6 Approaches 0 Driveways 78.1526	Freeway Ramps (Grade-Separated) Multilane (2 Lane, unspecified)	2006	Combines interchange ramps and frontage road. ICD estimated from Google Maps linework.
Advance, NC Davie Co. United States	NC 801 / I-40 EB Ramps (36.00655, -80.44083)	Roundabout Removed	All-Way Yield None	3 Approaches 0 Driveways 17.3907	Freeway Ramps (Grade-Separated) Single-Lane	2002	Developer-built "temporary" intersection fix. Previously controlled by one-way stop ICD estimated from Google Maps linework.
Phoenix, AZ Maricopa Co. United States	Happy Valley Rd. / I-17 NB Ramps (33.71291, -112.11477)	Roundabout Removed	All-Way Yield None	4 Approaches 0 Driveways 64.0077	Freeway Ramps (Grade-Separated) Multilane (2 Lane, unspecified)	2020	Initially constructed 2002, revised 2005. Removed in 2020, replaced with diverging diamond interchange: https://www.youtube.com/watch?v=Xgcxmf9UYWw. https://azdot.gov/adot-blog/requiem-roundabouts-least-ones-happy-valley-road 21442
Phoenix, AZ Maricopa Co. United States	Happy Valley Rd. / I-17 SB Ramps (33.71292, -112.12019)	Roundabout Removed	All-Way Yield None	3 Approaches 0 Driveways 62.4840	Freeway Ramps (Grade-Separated) Multilane (2 Lane, unspecified)	2020	Initially constructed 2002, revised 2005. Removed in 2020, replaced with diverging diamond interchange: https://www.youtube.com/watch?v=Xgcxmf9UYWw. https://azdot.gov/adot-blog/requiem-roundabouts-least-ones-happy-valley-road 21442
Frisco, CO Summit Co. United States	SH 9 / I-70 WB Ramps (39.59339, -106.09700)	Roundabout Existing	All-Way Yield None	5 Approaches 0 Driveways 34.0524	Freeway Ramps (Grade-Separated) Single-Lane	2000	Highway ref. pt. 70-202.35. ICD estimated from Google Maps linework.
Gig Harbor, WA Pierce Co. United States	Borgen Blvd. / SR 16 SB Ramps (47.35868, -122.61610)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 38.8342	Freeway Ramps (Grade-Separated) Single-Lane	2004	Opened March 2004. ICD estimated from Google Maps linework.
Kaukauna, WI Outagamie Co. United States	CTH J / US 41 SB Ramps (44.30645, -88.24948)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 35.8965	Freeway Ramps (Grade-Separated) Single-Lane	2010	Opened October 11, 2010. ICD estimated from Google Maps linework.
Columbia, MO Boone Co. United States	Business Loop 70 / I-70 WB Ramps / Creasy Springs Rd. (38.96655, -92.35241)	Roundabout Removed	All-Way Yield Unknown	5 Approaches 0 Driveways 94.7178	Freeway Ramps (Grade-Separated) Single-Lane	1996	First roundabout in Missouri by Missouri DOT. Originally built in 1996 per article: https://www.voxmagazine.com/news/all-about-roundabouts-in-columbia/article_93724b2b-8b20-5228-b4de-315c5c3d2004.html. Replaced with roundabout to immediate west. ICD estimated from Google Maps linework.
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.
Sterling Heights, MI Macomb Co. United States	Van Dyke Ave. (M-53) / 18 1/2 Mile Rd. (42.60148, -83.03119)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 76.2000	Freeway Ramps (Grade-Separated) Multilane (3+ Lane)	2005	Completed June 2005.
Kaukauna, WI Outagamie Co. United States	CTH J / US 41 NB Ramps (44.30463, -88.24939)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 37.6070	Freeway Ramps (Grade-Separated) Single-Lane	2010	Opened October 11, 2010. ICD estimated from Google Maps linework.
Avon, CO Eagle Co. United States	William J Post Blvd. / I-70 WB Ramps (39.62759, -106.49460)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 38.6349	Freeway Ramps (Grade-Separated) Multilane (2 Lane, unspecified)	2003	ICD estimated from Google Maps linework.
Avon, CO Eagle Co. United States	William J Post Blvd. / I-70 EB Ramps (39.62714, -106.49610)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 37.7153	Freeway Ramps (Grade-Separated) Multilane (2 Lane, unspecified)	2003	ICD estimated from Google Maps linework.
Newton, KS Harvey Co. United States	First St. / I-135 Ramps (38.04250, -97.32240)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 65.8419	Freeway Ramps (Grade-Separated) Single-Lane	2003	Single-point interchange. Previously controlled by one-way stop ICD estimated from Google Maps linework.
Hanover, MD Anne Arundel Co. United States	Arundel Mills Blvd. / MD 295 NB Ramps (39.15573, -76.74459)	Roundabout Removed	All-Way Yield None	3 Approaches 0 Driveways 26.8575	Freeway Ramps (Grade-Separated) Multilane (2 Lane, unspecified)	2002	ICD estimated from Google Maps linework. Replaced with DDI
Hanover, MD Anne Arundel Co. United States	Arundel Mills Blvd. / MD 295 SB Ramps (39.15677, -76.74617)	Roundabout Removed	All-Way Yield None	2 Approaches 0 Driveways 66.6796	Freeway Ramps (Grade-Separated) Multilane (2 Lane, unspecified)	2002	ICD estimated from Google Maps linework. Replaced with DDI.
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.
Truckee, CA Nevada Co. United States	Hwy 89 / I-80 EB Ramps (39.32243, -120.20770)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 55.4354	Freeway Ramps (Grade-Separated) Multilane (2 Lane, unspecified)	2005	ICD estimated from Google Maps linework.
Camp Verde, AZ Yavapai Co. United States	Middle Verde Rd. / I-17 NB Ramps (34.61039, -111.86160)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 34.4040	Freeway Ramps (Grade-Separated) Single-Lane	2006	ICD estimated from Google Maps linework.
Truckee, CA Nevada Co. United States	Hwy 89 / I-80 WB Ramps (39.32386, -120.20760)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 40.6518	Freeway Ramps (Grade-Separated) Multilane (2 Lane, unspecified)	2005	ICD estimated from Google Maps linework.
Acoma Indian Reservation, NM McKinley Co. United States	SH 30 / I-40 WB Ramps (35.07505, -107.56110)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 65.4884	Freeway Ramps (Grade-Separated) Multilane (2 Lane, unspecified)	2010	Merging right-turn bypass lane on north leg. Series of 3 roundabouts. ICD estimated from Google Maps linework.
Brighton, MI Livingston Co. United States	Lee Rd. / US 23 NB Ramps / Fieldcrest Dr. (42.50486, -83.75652)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 47.5461	Freeway Ramps (Grade-Separated) Multilane (2 Lane, unspecified)	2005	ICD estimated from Google Maps linework.
Brighton, MI Livingston Co. United States	Lee Rd. / US 23 SB Ramps (42.50605, -83.75954)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 37.8600	Freeway Ramps (Grade-Separated) Multilane (2 Lane, unspecified)	2006	Linked with Lee Rd/Whitmore Lake Rd roundabout. Previously controlled by one-way stop control ICD estimated from Google Maps linework.
Buena Vista Township, MI Saginaw Co. United States	M-81 / I-75 SB Ramps (43.45060, -83.89209)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 34.6818	Freeway Ramps (Grade-Separated) Single-Lane	2006	Right turn bypass lanes ICD estimated from Google Maps linework.
Buena Vista Township, MI Saginaw Co. United States	M-81 / I-75 NB Ramps (43.45056, -83.88958)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 34.6818	Freeway Ramps (Grade-Separated) Single-Lane	2006	Right turn bypass lanes ICD estimated from Google Maps linework.
Chattanooga, TN Hamilton Co. United States	SR 153 NB Ramps / Lake Resort Dr. (35.10986, -85.22842)	Roundabout Existing	All-Way Yield Unknown	3 Approaches 0 Driveways 55.6902	Freeway Ramps (Grade-Separated) Multilane (2 Lane, unspecified)	2006	At new intersection with new bridge and alignment of Lake Resort Drive. Former intersection was ~800 to the south. Non-symetric design. Some motions have two lanes. Previously controlled by signal ICD estimated from Google Maps linework.
Chattanooga, TN Hamilton Co. United States	SR 153 SB Ramps / N. Access Rd. / TVA offices (35.10868, -85.23122)	Roundabout Existing	All-Way Yield Unknown	4 Approaches 0 Driveways 97.7036	Freeway Ramps (Grade-Separated) Multilane (2 Lane, unspecified)	2006	N Access Road is a 4 lane arterial road. Fatal crash April 4, 2010. 11861-05. ICD estimated from Google Maps linework.
Jessup, MD Anne Arundel Co. United States	MD 198 (Laurel Fort Meade Rd.) / MD 32 EB Ramps (39.08997, -76.75736)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 53.3400	Freeway Ramps (Grade-Separated) Multilane (2 Lane, unspecified)	2002	Lanes reduced in 2010. 21442
Jessup, MD Anne Arundel Co. United States	MD 198 (Laurel Fort Meade Rd.) / MD 32 WB Ramps (39.09178, -76.75688)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 53.3400	Freeway Ramps (Grade-Separated) Multilane (2 Lane, unspecified)	2002	Lanes reduced in 2010. 21442
Acoma Indian Reservation, NM McKinley Co. United States	SH 30 / I-40 EB Ramps (35.07341, -107.56120)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 65.4897	Freeway Ramps (Grade-Separated) Multilane (2 Lane, unspecified)	2010	Merging right-turn bypass lane on west leg. Series of 3 roundabouts. ICD estimated from Google Maps linework.
Glenwood Springs, CO Garfield Co. United States	Mel Ray Rd. / I-70 WB Ramps / US 6 (39.56142, -107.36127)	Roundabout Existing	All-Way Yield None	5 Approaches 0 Driveways 44.1965	Freeway Ramps (Grade-Separated) Multilane (2 Lane, unspecified)	2006	ICD estimated from Google Maps linework.
Glenwood Springs, CO Garfield Co. United States	Mel Ray Rd. / I-70 EB Ramps / Midland Ave. / Riverine Rd. (39.56019, -107.36139)	Roundabout Existing	All-Way Yield None	4 Approaches 0 Driveways 46.9595	Freeway Ramps (Grade-Separated) Multilane (2 Lane, unspecified)	2006	1 of 2 at Exit 114 on I-70, observed under construction in 2005. ICD estimated from Google Maps linework.
Mesa, AZ Maricopa Co. United States	Brown Rd. / Loop 202 SB Ramps (33.43689, -111.65280)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 42.8563	Freeway Ramps (Grade-Separated) Multilane (2 Lane, unspecified)	2007	ICD estimated from Google Maps linework.
Mesa, AZ Maricopa Co. United States	Brown Rd. / Loop 202 NB Ramps (33.43694, -111.64850)	Roundabout Existing	All-Way Yield None	3 Approaches 0 Driveways 47.8396	Freeway Ramps (Grade-Separated) Multilane (2 Lane, unspecified)	2007	ICD estimated from Google Maps linework.
Woburn, MA Middlesex Co. United States	I-95 Ramps / MA 38 (Main St.) (42.49945, -71.15711)	Rotary Existing	Unknown Unknown	4 Approaches 0 Driveways 30.8196	Freeway Ramps (Grade-Separated) Multilane (2 Lane, unspecified)		ICD estimated from Google Maps linework.
Revere, MA Suffolk Co. United States	Copeland Circle [Rte 60 (Squire Rd.) / US 1 Ramps] (42.43008, -71.01710)	Rotary Existing	Unknown Unknown	4 Approaches 0 Driveways 381.0000	Freeway Ramps (Grade-Separated) Multilane (2 Lane, 2x2 max)		Retrofitted (November 2018) with multi-lane approaches/departures on the Route 1 ramps and roundabout style pavement markings and signs within the circulating roadway. ICD = 1250 ft x 880 ft. 21442
Boston, MA Suffolk Co. United States	Willard St. / I-93 Ramps / Furnace Brook Expwy. (42.24208, -71.02673)	Rotary Existing	Unknown Unknown	4 Approaches 0 Driveways 99.0276	Freeway Ramps (Grade-Separated) Multilane (2 Lane, unspecified)		ICD estimated from Google Maps linework.
Brighton, CO Adams Co. United States	W. Bridge St. / US 85 NB Ramps (39.98683, -104.82320)	Roundabout Existing	Unknown Unknown	3 Approaches 0 Driveways 43.0090	Freeway Ramps (Grade-Separated) Multilane (2 Lane, unspecified)	2006	Part of double-dumbbell interchange with two roundabouts and one storage lane into railroad crossing. ICD estimated from Google Maps linework.
Brighton, CO Adams Co. United States	W. Bridge St. / US 85 SB Ramps (39.98682, -104.82450)	Roundabout Existing	Unknown Unknown	5 Approaches 0 Driveways 43.9241	Freeway Ramps (Grade-Separated) Multilane (2 Lane, unspecified)	2006	Part of double-dumbbell interchange with two roundabouts and one storage lane into railroad crossing. ICD estimated from Google Maps linework.