| City, 
                State County Country | Intersection (Lat, Lng) | Type Status | Control Type / Other Control Type | Approaches / Driveways / ICD (m) | Functional Class / LaneType | Year Completed | Comments | 
|---|---|---|---|---|---|---|---|
| Osseo,
                MN Hennepin Co. United States | Zachary Ln. N / TH 610 WB Ramps (45.13128, -93.42254) | Roundabout Existing | All-Way Yield None | 3 Approaches 0 Driveways 44.6568 | Freeway Ramps (Grade-Separated) Multilane (2 Lane, unspecified) | 2012 | ICD estimated from Google Maps linework. | 
| Osseo,
                MN Hennepin Co. United States | Elm Creek Blvd. / 99th Ave. / James Deane Blvd. / TH 610 WB Off-Ramp (45.13323, -93.44083) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 46.3403 | Freeway Ramps (Grade-Separated) Single-Lane | 2012 | ICD estimated from Google Maps linework. | 
| Osseo,
                MN Hennepin Co. United States | Jewel Ln. / 72nd Ave. N (45.08544, -93.49850) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 29.5140 | Other (At-Grade) Single-Lane | 2008 | No splitter islands on three legs. ICD estimated from Google Maps linework. | 
| Osman-Yurt,
                Dagestan Khasavyurtovsky District Russia | E50-P217 (Makhachkalinskoye shosse) / ulitsa Saygidnova / Novolakskoye shosse (43.23993, 46.56551) | Other Existing | Uncontrolled Unknown | 4 Approaches 0 Driveways | Other (At-Grade) Unknown | ||
| Oslo,
                Oslo Oslo Norway | Schweigaards gate / Klostergata (59.90757, 10.77266) | Other Existing | All-Way Yield None | 3 Approaches 0 Driveways | Other (At-Grade) Single-Lane | Pedestrian access to central island. | |
| Oslo,
                Oslo Oslo Norway | Tvetenveien / Rundtjernveien / (parking) (59.91605, 10.84865) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways | Other (At-Grade) Single-Lane | ||
| Oslo,
                Oslo Oslo Norway | Tvetenveien / Haugerudveien (59.91805, 10.85079) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways | Other (At-Grade) Single-Lane | ||
| Oslo,
                Oslo Oslo Norway | Fv162 (Frederiks Gate - Ruseløkkveien - Munkedamsveien) / Henrik Ibsens Gate / Stortingsgata (59.91502, 10.73224) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways | Other (At-Grade) Multilane (2 Lane, unspecified) | Trams through central island. | |
| Oslo,
                Oslo Oslo Norway | Problemveien / Torgny Segerstedts Vei / Ring 3 EB Ramps (59.94674, 10.72229) | Roundabout Existing | All-Way Yield None | 3 Approaches 0 Driveways | Freeway Ramps (Grade-Separated) Multilane (2 Lane, unspecified) | ||
| Oslo,
                Oslo Oslo Norway | Torgny Segerstedts Vei / Klaus Torgårds Vei / Ring 3 WB Ramps (59.94821, 10.72255) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways | Freeway Ramps (Grade-Separated) Multilane (2 Lane, unspecified) | ||
| Oslo,
                Oslo Oslo Norway | Nylandsveien / Hausmanns Gate (59.91505, 10.76052) | Roundabout Existing | All-Way Yield None | 3 Approaches 0 Driveways | Other (At-Grade) Multilane (2 Lane, unspecified) | ||
| Oslo,
                Oslo Oslo Norway | Trondheimsveien / Christian Michelsens gate / Grenseveien (59.92615, 10.77591) | Other Existing | All-Way Yield At-grade Rail Crossing Signals/Gates (controlling circulatory roadway only) | 4 Approaches 0 Driveways | Other (At-Grade) Single-Lane | Rectangular shaped. Tram railway through central island. | |
| Oslo,
                Oslo Oslo Norway | Trondheimsveien / Fagerheimgata (59.93323, 10.77856) | Other Existing | All-Way Yield At-grade Rail Crossing Signals/Gates (controlling circulatory roadway only) | 4 Approaches 0 Driveways | Other (At-Grade) Multilane (2 Lane, unspecified) | Tram railway through central island. | |
| Oslo,
                Oslo Oslo Norway | Drammensveien / Karenslyst allé / E18 (Sjølystveien) SB On-Ramp (59.92146, 10.67642) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways | Freeway Ramps (Grade-Separated) Single-Lane | ||
| Oslo,
                Oslo Oslo Norway | Drammensveien / E18 (Sjølystveien) NB Ramps (59.92065, 10.67546) | Roundabout Existing | All-Way Yield None | 3 Approaches 0 Driveways | Freeway Ramps (Grade-Separated) Multilane (2 Lane, unspecified) | ||
| Oslo,
                Oslo Oslo Norway | Ullernchausséen / Vækerøveien (59.92387, 10.64421) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways | Other (At-Grade) Multilane (2 Lane, unspecified) | ||
| Oslo,
                Oslo Oslo Norway | Bergensgata / Stavangergata / Moldegata (59.94393, 10.75966) | Roundabout Existing | All-Way Yield None | 4 Approaches 1 Driveways | Other (At-Grade) Single-Lane | ||
| Oslo,
                Oslo Oslo Norway | Bergensgata / Kristoffer Aamots Gate / Maridalsveien (59.94624, 10.76043) | Roundabout Existing | All-Way Yield None | 3 Approaches 0 Driveways | Other (At-Grade) Single-Lane | ||
| Oslo,
                Oslo Oslo Norway | Kristoffer Aamots Gate / Nydalsveien (59.94703, 10.76362) | Roundabout Existing | All-Way Yield None | 3 Approaches 0 Driveways | Other (At-Grade) Single-Lane | ||
| Oslo,
                Oslo Oslo Norway | Nordbergveien / Rolf Wickstrøms vei / Kaj Munks vei (59.95256, 10.75038) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways | Other (At-Grade) Single-Lane | ||
| Oslo,
                Oslo Oslo Norway | Sognsveien / Carl Kjelsens vei (59.96121, 10.73520) | Roundabout Existing | All-Way Yield None | 3 Approaches 1 Driveways | Other (At-Grade) Single-Lane | ||
| Oslo,
                Oslo Oslo Norway | Nordstrandveien / Langbølgen (59.86182, 10.81594) | Roundabout Existing | All-Way Yield None | 3 Approaches 0 Driveways | Other (At-Grade) Single-Lane | ||
| Oslo,
                Oslo Oslo Norway | Lambertseterveien / Cecilie Thoresens vei / Langbølgen (59.87391, 10.81216) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways | Other (At-Grade) Single-Lane | ||
| Oslo,
                Oslo Oslo Norway | Østensjøveien / Haakon Tveters vei (59.89838, 10.83136) | Roundabout Existing | All-Way Yield None | 3 Approaches 0 Driveways | Other (At-Grade) Single-Lane | ||
| Oslo,
                Oslo Oslo Norway | Konows gate / E6 Ramps (59.90256, 10.78272) | Roundabout Existing | All-Way Yield None | 3 Approaches 0 Driveways | Freeway Ramps (Grade-Separated) Single-Lane | ||
| Oslo,
                Oslo Oslo Norway | Konows gate / E6 (Strømsveien) Ramps (59.90329, 10.78144) | Roundabout Existing | All-Way Yield None | 3 Approaches 0 Driveways | Freeway Ramps (Grade-Separated) Single-Lane | ||
| Oslo,
                Oslo Oslo Norway | Sørkedalsveien / Vækerøveien (59.94991, 10.64447) | Roundabout Existing | All-Way Yield None | 3 Approaches 1 Driveways | Other (At-Grade) Single-Lane | ||
| Oslo,
                Oslo Oslo Norway | Nordstrandveien / E6 SB Ramps (59.86249, 10.82913) | Roundabout Existing | All-Way Yield None | 3 Approaches 0 Driveways | Freeway Ramps (Grade-Separated) Single-Lane | ||
| Oslo,
                Oslo Oslo Norway | Nordstrandveien / Skullerudbakken / E6 NB Ramps (59.86370, 10.83147) | Roundabout Existing | All-Way Yield None | 3 Approaches 0 Driveways | Freeway Ramps (Grade-Separated) Single-Lane | ||
| Oslo,
                Oslo Oslo Norway | Maridalsveien  / Fredensborgveien / Møllerveien (59.92122, 10.75117) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways | Other (At-Grade) Single-Lane | ||
| Oslo,
                Oslo Oslo Norway | Romsåsveien / Rv4 (Trondheimsveien) Ramps (59.96059, 10.88522) | Roundabout Existing | All-Way Yield None | 3 Approaches 1 Driveways | Freeway Ramps (Grade-Separated) Single-Lane | ||
| Oslo,
                Oslo Oslo Norway | Jerikoveien / E6 Ramps / Sam Eydes Vei (59.93810, 10.89012) | Roundabout Existing | All-Way Yield Unknown | 4 Approaches 0 Driveways | Freeway Ramps (Grade-Separated) Multilane (2 Lane, unspecified) | ||
| Oslo,
                Oslo Oslo Norway | Jerikoveien / E6 Ramps / Karihaugveien (59.93672, 10.89012) | Roundabout Existing | All-Way Yield Unknown | 4 Approaches 0 Driveways | Freeway Ramps (Grade-Separated) Multilane (2 Lane, unspecified) | ||
| Oslo,
                Oslo Oslo Norway | Rte 191 / Strømsveien (59.93218, 10.86050) | Roundabout Existing | All-Way Yield Unknown | 4 Approaches 0 Driveways | Other (At-Grade) Multilane (2 Lane, unspecified) | Right-turn-only lanes on north and south legs. Grade-separated pedestrian tunnels. | |
| Oslo,
                Oslo Oslo Norway | Rte 191 (Nedre Kalbakkvei) / Alfasetveien (59.93613, 10.85896) | Roundabout Existing | All-Way Yield Unknown | 3 Approaches 0 Driveways | Other (At-Grade) Multilane (2 Lane, unspecified) | ||
| Oskaloosa,
                IA Mahaska Co. United States | Hwy 432 / Old Hwy 163 / Pella Ave. / Orchard Ave. (41.30376, -92.66716) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 35.8882 | Other (At-Grade) Single-Lane | 2004 | Completed April 2004. Site has sunken hole in central island with tunnels for bike path that passes under circulatory roadway. Experienced two single-vehicle crashes into sunken central island (alcohol-related). ICD estimated from Google Maps linework. | 
| Osijek,
                Osijek-Baranja Croatia | Adama Reisnera / Županijska / Vinkovačka cesta / Svetog Leopolda Bogdana Mandića (45.55453, 18.67527) | Other Existing | All-Way Yield None | 5 Approaches 0 Driveways | Other (At-Grade) Multilane (2 Lane, unspecified) | Trams through central island. | |
| Oshkosh,
                WI Winnebago Co. United States | Country Park Dr. / Community Park Dr. (44.07467, -88.53138) | Other Existing | Unknown Unknown | 3 Approaches 0 Driveways 0.0000 | Other (At-Grade) Single-Lane | No splitter islands. | |
| Oshkosh,
                WI Winnebago Co. United States | Winnegago County Community Park Dr. / Winnegago County Community Park Entrance (44.08167, -88.53360) | Other Existing | All-Way Yield Unknown | 3 Approaches 0 Driveways 0.0000 | Other (At-Grade) Single-Lane | No splitter islands on west or southeast legs. | |
| Oshkosh,
                WI Winnebago Co. United States | Jackson St. / Murdock Ave. (44.03947, -88.54265) | Roundabout Existing | All-Way Yield Rectangular Rapid Flashing Beacon (RRFB) | 4 Approaches 0 Driveways 41.1480 | Other (At-Grade) Multilane (2 Lane, 2x2 max) | 2010 | |
| Oshkosh,
                WI Winnebago Co. United States | CTH E (Witzel Ave.) / Koeller St. (44.01805, -88.58098) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 48.7680 | Other (At-Grade) Multilane (2 Lane, 2x2 max) | 2010 | Opened September 24, 2010. | 
| Oshkosh,
                WI Winnebago Co. United States | CTH E (Witzel Ave.) / Washburn St. (44.01808, -88.58321) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 50.2920 | Other (At-Grade) Multilane (2 Lane, 2x2 max) | 2010 | Opened September 24, 2010. | 
| Oshkosh,
                WI Winnebago Co. United States | US 45 / Fernau Ave. / Lake Butte des Morts Dr. (44.05513, -88.57150) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 50.2920 | Other (At-Grade) Multilane (2 Lane, 2x2 max) | 2010 | Opened August 24, 2010. | 
| Oshkosh,
                WI Winnebago Co. United States | W 9th Ave. / S Washburn St. (44.01085, -88.58483) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 50.2920 | Other (At-Grade) Multilane (2 Lane, 2x2 max) | 2011 | |
| Oshkosh,
                WI Winnebago Co. United States | W 9th Ave. / US 41 SB Ramps (44.01089, -88.58318) | Roundabout Existing | All-Way Yield None | 3 Approaches 0 Driveways 50.2920 | Freeway Ramps (Grade-Separated) Multilane (2 Lane, 2x2 max) | 2011 | |
| Oshkosh,
                WI Winnebago Co. United States | W 9th Ave. / US 41 NB Ramps (44.01078, -88.58145) | Roundabout Existing | All-Way Yield None | 3 Approaches 0 Driveways 50.2920 | Freeway Ramps (Grade-Separated) Multilane (2 Lane, 2x2 max) | 2011 | |
| Oshkosh,
                WI Winnebago Co. United States | W 9th Ave. / S Koeller St. (44.01079, -88.57978) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 50.2920 | Other (At-Grade) Multilane (2 Lane, 2x2 max) | 2011 | |
| Oshkosh,
                WI Winnebago Co. United States | US 45 / US 41 SB Ramps (44.06074, -88.57443) | Roundabout Existing | All-Way Yield None | 3 Approaches 0 Driveways 54.8640 | Freeway Ramps (Grade-Separated) Multilane (2 Lane, 2x2 max) | 2011 | |
| Oshkosh,
                WI Winnebago Co. United States | STH 21 (Omro Rd.) / N Koeller St. / Oshkosh Ave. (44.03258, -88.57882) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 45.7200 | Other (At-Grade) Multilane (2 Lane, 2x1 max) | 2012 | Roundabout relocated to west of previous intersection. Series of 4 roundabouts. Opened June 18, 2012. | 
| Oshkosh,
                WI Winnebago Co. United States | STH 21 (Omro Rd.) / Brooks Ln. / N Washburn St. (44.03244, -88.58758) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 48.9435 | Other (At-Grade) Multilane (3+ Lane) | 2012 | Opened June 8, 2012. Three-lane roundabout. Series of 4 roundabouts. Functional Class: Arterial ICD estimated from Google Maps linework. | 
| Oshkosh,
                WI Winnebago Co. United States | STH 21 (Omro Rd.) / US 41 SB Ramps (44.03272, -88.58319) | Roundabout Existing | All-Way Yield None | 3 Approaches 0 Driveways 60.1058 | Freeway Ramps (Grade-Separated) Multilane (3+ Lane) | 2012 | Opened August 30, 2012. Three-lane roundabout. Series of 4 roundabouts. ICD estimated from Google Maps linework. | 
| Oshkosh,
                WI Winnebago Co. United States | STH 21 (Omro Rd.) / US 41 NB Ramps (44.03271, -88.58178) | Roundabout Existing | All-Way Yield None | 3 Approaches 0 Driveways 140.8193 | Freeway Ramps (Grade-Separated) Multilane (3+ Lane) | 2012 | Opened October 29, 2012. Three-lane roundabout. Series of 4 roundabouts. ICD estimated from Google Maps linework. | 
| Oshkosh,
                WI Winnebago Co. United States | CR T / CR Y (44.08259, -88.58346) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 29.1697 | Other (At-Grade) Single-Lane | 2013 | Year Completed estimated (2011-2015). ICD estimated from Google Maps linework. | 
| Oshawa,
                ON Durham Canada | Britannia Ave. / Bridle Rd. (43.95601, -78.89312) | Roundabout Existing | All-Way Yield Unknown | 4 Approaches 0 Driveways 36.9699 | Other (At-Grade) Single-Lane | 2013 | ICD estimated from Google Maps linework. | 
| Oshawa,
                ON Durham Canada | Northern Dancer Dr. / Hackett Pl. / Solar Pl. (43.95353, -78.89052) | Roundabout Existing | All-Way Yield Unknown | 3 Approaches 0 Driveways 30.0930 | Other (At-Grade) Single-Lane | 2007 | Year Completed estimated (2005-2009). ICD estimated from Google Maps linework. | 
| Oshawa,
                ON Durham Canada | Bridle Rd. / Northern Dancer Dr. (43.95341, -78.89266) | Roundabout Existing | All-Way Yield Unknown | 4 Approaches 0 Driveways 34.3921 | Other (At-Grade) Single-Lane | 2007 | Year Completed estimated (2005-2009). ICD estimated from Google Maps linework. | 
| Oshawa,
                ON Durham Canada | Secretariat Ave. / Woodbine Ave. (43.95049, -78.89431) | Roundabout Existing | All-Way Yield Unknown | 4 Approaches 0 Driveways 32.6741 | Other (At-Grade) Single-Lane | 2006 | Year Completed estimated (2005=2009). ICD estimated from Google Maps linework. | 
| Oshawa,
                ON Durham Canada | Conlin Rd. W / Thornton Rd. N (43.94367, -78.91589) | Roundabout Existing | All-Way Yield Unknown | 4 Approaches 0 Driveways 42.1372 | Other (At-Grade) Single-Lane | 2014 | ICD estimated from Google Maps linework. | 
| Oshawa,
                ON Durham Canada | Bridle Rd. / Gulfstream Dr. (43.96215, -78.89170) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 36.1064 | Other (At-Grade) Single-Lane | 2016 | ICD estimated from Google Maps linework. | 
| Oshawa,
                ON Durham Canada | Steeplechase St. / Sharavogue Ave. (43.95894, -78.89689) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 24.0722 | Other (At-Grade) Single-Lane | 2014 | Central island completed 2014; splitter islands added 2018-2019. ICD estimated from Google Maps linework. | 
| Oshawa,
                ON Durham Canada | Britannia Ave W / Kentucky Derby Way (43.95441, -78.90661) | Roundabout Existing | All-Way Yield None | 3 Approaches 0 Driveways 45.0000 | Other (At-Grade) Multilane (2 Lane, 2x1 max) | 2015 | |
| Oshawa,
                ON Durham Canada | Britannia Ave. W / Windfields Farm Dr. (43.95341, -78.91118) | Roundabout Existing | All-Way Yield None | 3 Approaches 1 Driveways 45.0000 | Other (At-Grade) Multilane (2 Lane, 2x1 max) | 2017 | |
| Oshawa,
                ON Durham Canada | Windfields Farm Dr. W / Stallion Dr. / Bandsman Crescent (43.95999, -78.91461) | Roundabout Existing | All-Way Yield Unknown | 4 Approaches 0 Driveways 35.0000 | Other (At-Grade) Single-Lane | 2018 | |
| Oshawa,
                ON Durham Canada | Windfield Farms Dr. W / Thoroughbred St. (43.96297, -78.90465) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 38.0000 | Other (At-Grade) Single-Lane | 2018 | Year Completed estimated (2017-2018). | 
| Osgood,
                ND Cass Co. United States | Rocking Horse Circle (46.80800, -96.88756) | Other Existing | Unknown Unknown | 4 Approaches 0 Driveways 0.0000 | Other (At-Grade) Unknown | Buildings and parking in central island. | |
| Osceola,
                IN Elkhart Co. United States | Ash Rd. / Edison Rd. (41.69543, -86.06169) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 35.6718 | Other (At-Grade) Single-Lane | 2018 | date: https://www.southbendtribune.com/news/local/at-t-blamed-for-construction-delay-of-edison-ash-roundabout/article_c7e4abd2-0d4c-5cb2-9438-0d8280388751.html ICD estimated from Google Maps linework. | 
| Osby,
                Skåne County Osby Sweden | Södra Portgatan / Östra Storgatan / Såggatan / Östra Järnvägsgatan (56.37858, 13.99427) | Roundabout Existing | All-Way Yield None | 5 Approaches 0 Driveways 30.0000 | Other (At-Grade) Single-Lane | ||
| Osby,
                Skåne County Osby Sweden | Stenvägen / Kyrkogatan (56.38437, 13.99964) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 30.0000 | Other (At-Grade) Single-Lane | 2013 | Previous control was yield on minor approaches. Year Completed estimated (2010-2015). | 
| Osby,
                Skåne County Osby Sweden | Rte 15 / Västra Storgatan (56.38504, 13.99663) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 50.0000 | Other (At-Grade) Single-Lane | 2010 | |
| Osage Beach,
                MO Camden Co. United States | Nichols Rd. / (medical center parking) (38.12308, -92.68148) | Roundabout Existing | All-Way Yield None | 3 Approaches 0 Driveways 32.8847 | Other (At-Grade) Single-Lane | 2016 | http://www.californiademocrat.com/news/news/story/2016/oct/06/nichols-road-closed-osage-beach-pky-us-54-while-roadwork-continues/643517/ ICD estimated from Google Maps linework. | 
| Osage Beach,
                MO Camden Co. United States | Burton Duenke Ln. / KK Dr. (38.11672, -92.69313) | Roundabout Existing | All-Way Yield None | 3 Approaches 0 Driveways 36.6461 | Other (At-Grade) Single-Lane | 2011 | Right turn bypass lane. ICD estimated from Google Maps linework. | 
| Orsk,
                Orenburg Orsk Russia | Dneprovskiy pereulok / Orskiy prospekt / Bratskaya ulitsa (51.22519, 58.62242) | Other Existing | Unknown Unknown | 4 Approaches 0 Driveways | Other (At-Grade) Unknown | Trams through central island. | |
| Orrell,
                England Greater Manchester United Kingdom | Eccles Rd. / Kitt Green Rd. / City Rd. (53.54879, -2.68274) | Roundabout Existing | All-Way Yield None | 3 Approaches 0 Driveways | Other (At-Grade) Single-Lane | ||
| Orrell,
                England Greater Manchester United Kingdom | M58 / M6 SB Ramps (53.53454, -2.69546) | Signalized Roundabout/Circle Existing | Signal Unknown | 2 Approaches 0 Driveways | Freeway Ramps (Grade-Separated) Multilane (2 Lane, unspecified) | ||
| Orrell,
                England Greater Manchester United Kingdom | M58 / M6 NB Ramps (53.53523, -2.70049) | Signalized Roundabout/Circle Existing | Signal Unknown | 3 Approaches 0 Driveways | Freeway Ramps (Grade-Separated) Multilane (2 Lane, unspecified) | ||
| Orpington,
                England Kent United Kingdom | A21 / M25 Ramps (51.34693, 0.15636) | Roundabout Existing | All-Way Yield Unknown | 3 Approaches 0 Driveways | Freeway Ramps (Grade-Separated) Multilane (2 Lane, unspecified) | ||
| Oroville,
                CA Butte Co. United States | SR 191 (Clark Rd.) / Durham Pentz Rd. (39.64733, -121.63448) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 0.0000 | Other (At-Grade) Single-Lane | 2019 | Painted splitter islands and truck apron; gravel inside the center island. Year Completed estimated (2018-2019). | 
| Oroville,
                CA Butte Co. United States | Montgomery St. / Washington Ave. / Table Mountain Blvd. (39.51611, -121.54970) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 36.8544 | Other (At-Grade) Single-Lane | 2008 | ICD estimated from Google Maps linework. | 
| Oroville,
                CA Butte Co. United States | Table Mountain Blvd. / Nelson Ave. / Cherokee Rd. (39.52418, -121.55881) | Roundabout Existing | All-Way Yield Unknown | 4 Approaches 0 Driveways 40.5351 | Other (At-Grade) Single-Lane | 2016 | Yield-controlled right-turn bypass lane on northeast leg. ICD estimated from Google Maps linework. | 
| Oronoco,
                MN Olmsted Co. United States | STH 31 / Wazuweeta Rd. (44.18054, -92.58227) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 44.5385 | Other (At-Grade) Multilane (2 Lane, unspecified) | 2014 | Year Completed estimated (2011-2015). ICD estimated from Google Maps linework. | 
| Orono,
                ME Penobscot Co. United States | US 2 (Park St.) / Rangeley Rd. (44.89256, -68.66258) | Roundabout Existing | All-Way Yield Rectangular Rapid Flashing Beacon (RRFB) | 3 Approaches 1 Driveways 37.2284 | Other (At-Grade) Multilane (2 Lane, unspecified) | 2018 | Hybrid multilane roundabout with right-turn bypasses. ICD estimated from Google Maps linework. | 
| Orono,
                ME Penobscot Co. United States | Stillwater Ave. / Forest Ave. (44.89217, -68.70227) | Roundabout Existing | All-Way Yield Unknown | 4 Approaches 0 Driveways 33.8442 | Other (At-Grade) Single-Lane | 2013 | ICD estimated from Google Maps linework. | 
| Oromocto,
                NB Sunbury Canada | Restigouche Rd. / Miramichi Rd. (45.83573, -66.48306) | Roundabout Existing | Unknown Unknown | 4 Approaches 0 Driveways 64.9046 | Other (At-Grade) Single-Lane | 2002 | ICD estimated from Google Maps linework. | 
| Oromocto,
                NB Sunbury Canada | Miramichi Rd. / Commerce Dr. (45.83286, -66.48817) | Roundabout Existing | Unknown Unknown | 0 Approaches 0 Driveways 56.5864 | Other (At-Grade) Unknown | 2003 | ICD estimated from Google Maps linework. | 
| Oromocto,
                NB Sunbury Canada | Miramichi Rd. / St Lawrence Ave. (45.84055, -66.48024) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 67.0000 | Other (At-Grade) Single-Lane | Before 2002. | |
| Oro Valley,
                AZ Pima Co. United States | W Moore Rd. / La Cañada Dr. (32.43835, -110.99109) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways 43.3430 | Other (At-Grade) Single-Lane | 2019 | Right-turn-only lanes on all four legs. https://news.azpm.org/p/news-splash/2019/11/26/162279-oro-valley-opens-roundabout/ ICD estimated from Google Maps linework. | 
| Ormskirk,
                England Lancs United Kingdom | A59 (Holborn Hill - County Rd.) / B5319 (Aughton St.) / B5197 (Saint Anne's Rd.) / Cottage Ln. (53.56386, -2.89428) | Roundabout Existing | All-Way Yield None | 5 Approaches 0 Driveways | Other (At-Grade) Multilane (2 Lane, unspecified) | ||
| Ormond Beach,
                FL Volusia Co. United States | Allwood Green Blvd. / Cypress Grove Ln. / Woodside Lake Dr. (29.24892, -81.09800) | Other Existing | Unknown Unknown | 3 Approaches 0 Driveways 0.0000 | Other (At-Grade) Single-Lane | No splitter islands. | |
| Ormond Beach,
                FL Volusia Co. United States | Chelsea Place Ave. / Nottinghill St. (29.26148, -81.10212) | Other Existing | Unknown Unknown | 3 Approaches 0 Driveways 0.0000 | Other (At-Grade) Unknown | No splitter islands. | |
| Ormiston,
                Queensland Australia | Sturgeon St. / Northern Arterial Rd. (-27.51197, 153.25532) | Roundabout Existing | All-Way Yield None | 3 Approaches 1 Driveways | Other (At-Grade) Single-Lane | ||
| Ormiston,
                Queensland Australia | Sturgeon St. / Delancey St. (-27.51183, 153.25223) | Roundabout Existing | All-Way Yield None | 3 Approaches 1 Driveways | Other (At-Grade) Single-Lane | ||
| Ormeau,
                Queensland Gold Coast Australia | Computer Rd. / Lahrs Rd. / Eastern Service Rd. / Mavis Ct. / M1 (Pacific Motorway) SB Ramps (-27.75726, 153.24302) | Roundabout Existing | All-Way Yield None | 5 Approaches 0 Driveways | Freeway Ramps (Grade-Separated) Single-Lane | ||
| Ormeau,
                Queensland Gold Coast Australia | Eggersdorf Rd. / Arthur Way / (parking) (-27.78619, 153.25911) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways | Other (At-Grade) Single-Lane | ||
| Ormeau,
                Queensland Gold Coast Australia | Eggersdorf Rd. / Jacob's Ridge Rd. / Achievement Dr. (-27.78320, 153.26382) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways | Other (At-Grade) Single-Lane | ||
| Ormeau,
                Queensland Gold Coast Australia | Eggersdorf Rd. / M1 (Pacific Motorway) SB Ramps / Peachey Rd. / Lahrs Rd. / Creek St. (-27.78608, 153.25717) | Roundabout Existing | All-Way Yield None | 5 Approaches 0 Driveways | Freeway Ramps (Grade-Separated) Multilane (2 Lane, unspecified) | ||
| Ormeau,
                Queensland Gold Coast Australia | Peachey Rd. / M1 (Pacific Motorway) NB Ramps / Orange Mountain Rd. / Tillyroen Rd. (-27.78722, 153.25586) | Roundabout Existing | All-Way Yield None | 5 Approaches 0 Driveways | Freeway Ramps (Grade-Separated) Multilane (2 Lane, unspecified) | ||
| Ormeau,
                Queensland Gold Coast Australia | Peachey Rd. / Vaughan Dr. (-27.78615, 153.25024) | Roundabout Existing | All-Way Yield None | 3 Approaches 1 Driveways | Other (At-Grade) Single-Lane | ||
| Ormeau,
                Queensland Gold Coast Australia | Eggersdorf Rd. / Maidenwell Rd. (-27.78086, 153.27798) | Roundabout Existing | All-Way Yield None | 3 Approaches 0 Driveways | Other (At-Grade) Single-Lane | ||
| Ormeau,
                Queensland Gold Coast Australia | Maidenwell Rd. / Carrieton St. (-27.77921, 153.27665) | Roundabout Existing | All-Way Yield None | 3 Approaches 0 Driveways | Other (At-Grade) Single-Lane | ||
| Orlová,
                Moravia-Silesia Karviná Czechia | II/470 (Těšínská - Slezská) / Těšínská / Slezská (49.84877, 18.41571) | Roundabout Existing | All-Way Yield None | 4 Approaches 0 Driveways | Other (At-Grade) Single-Lane |