The Greenbelt Lines designated as the Greenbelt Road-New Carrollton Line on Route P20, and Hanover Parkway-New Carrollton Line on Route P21, are daily bus routes operated by the Washington Metropolitan Area Transit Authority between Greenbelt station of the Green and Yellow Lines of Washington Metro and New Carrollton station of the Orange and Silver Lines of the Washington Metro. Both routes provides service between New Carrollton and Greenbelt connecting travelers to both communities without having to enter Washington, D.C. by train.
Route description and service
Routes P20 and P21 operate daily between Greenbelt station and New Carrollton station. The route operates between 5:00 am and 12:00 am on weekdays and between 6:00 am and 10:00 pm on the weekends. Route P20 trips skip the Beltway Plaza Mall loop on weekdays only before 7:45 am. Both routes operates every 30 minutes weekdays, with the P20 operating every 30 minutes on weekends and the P21 operating every 60 minutes on weekends. Both routes replaced the previous G12 and G14 on June 29, 2025.
Both routes operate out of Landover division.
Former G12 stops
Bus stopDirectionConnectionsPrince George's County, MarylandGreenbelt stationBus Bay EWestbound station,Eastbound terminal Metrobus: 89M, C2, G14, R12 RTA: 302/G TheBus: 11, 15X, 16 Shuttle-UM: 129 BoltBus Washington Metro: MARC: Camden LineGreenbelt Metro Drive / Cherrywood LaneBidirectional Metrobus: 89M, C2, G14, R12 RTA: 302/G TheBus: 11, 15, 16 Shuttle-UM: 129Cherrywood Lane / Ivy LaneBidirectional Metrobus: 89M RTA: 302/G TheBus: 11 Shuttle-UMIvy Lane / #6400Bidirectional Metrobus: 89M TheBus: 11Ivy Lane / Greenbelt MarriottBidirectional Metrobus: 89M TheBus: 11Ivy Lane / Turner PlaceBidirectional Metrobus: 89M TheBus: 11Kenilworth Avenue / Crescent RoadWestbound Metrobus: 87 TheBus: 11Ivy Lane / Ridge RoadBidirectional Shuttle-UMIvy Lane / Lastner LaneBidirectional Shuttle-UMLastner Lane / Julien CourtBidirectional Shuttle-UMRidge Road / #73 CourtBidirectionalRidge Road / Research RoadBidirectionalRidge Road / Laurel Hill RoadBidirectionalRidge Road / #57-#58 RoadBidirectionalRidge Road / Plateau PlaceBidirectionalRidge Road / NorthwayBidirectionalRidge Road / EastwayBidirectionalRidge Road / #35-#38 CourtBidirectionalRidge Road / Hamilton PlaceBidirectionalRidge Road / GardenwayBidirectional Metrobus: G14Crescent Road / GardenwayBidirectional Metrobus: G14 TheBus: 11Southway / Crescent RoadBidirectional Metrobus: G14 TheBus: 11Ridge Road / 12 CourtBidirectional Metrobus: G14Westway / Ridge RoadBidirectional Metrobus: G14Lakeside Drive / WestwayBidirectional Metrobus: G14Lakeside Drive / Lakecrest DriveBidirectional Metrobus: G14Lakeside Drive / Lakecrest CircleWestbound Metrobus: G14Lakeside Drive / American Legion DriveEastbound Metrobus: G14Greenbelt Road / Greenway Shopping CenterBidirectional Metrobus: G14 TheBus: 11, 15X, 16 Shuttle-UMHanover Parkway / Greenbelt RoadBidirectional TheBus: 11 (Westbound only) Shuttle-UMHanover Parkway / #7722Bidirectional TheBus: 11 (Westbound only) Shuttle-UMHanover Parkway / #7800Bidirectional TheBus: 11 (Westbound only) Shuttle-UMHanover Parkway / Mandan RoadBidirectional TheBus: 11 (Westbound only) Shuttle-UMMandan Road / #7648-#7676Bidirectional TheBus: 11 (Westbound only) Shuttle-UMMandan Road / #7516-#7546Bidirectional TheBus: 11 (Westbound only) Shuttle-UMMandan Road / #7501-#7509Bidirectional TheBus: 11 (Westbound only) Shuttle-UMMandan Road / Court #7Eastbound Shuttle-UMMandan Road / Canning TerraceWestbound TheBus: 11 Shuttle-UMOra Glen Drive / Mandan RoadBidirectional TheBus: 11 (Westbound only) Shuttle-UMOra Glen Drive / Morrison DriveBidirectional TheBus: 11 (Westbound only) Shuttle-UMOra Glen Drive / Wintergreen CircleEastboundOra Glen Drive / Greenbrook DriveWestboundOra Glen Drive / Ora CourtEastboundOra Glen Drive / South Ora CourtWestboundHandover Parkway / Greenway Center DriveEastbound TheBus: 11, 16Hanover Parkway / Ora Glen DriveEastbound TheBus: 16Hanover Parkway / Handover DriveBidirectional TheBus: 11 (Eastbound only), 16Hanover Parkway / Greenbrook DriveBidirectional TheBus: 16Hanover Parkway / Hunting RidgeBidirectional TheBus: 16Hanover Parkway / Village Park DriveBidirectional TheBus: 16Hanover Parkway / Megan LaneBidirectional TheBus: 16Hanover Parkway / Spring Manor DriveBidirectional TheBus: 16Hanover Parkway / Megan LaneBidirectional TheBus: 16Hanover Parkway / Green Crescent CourtBidirectional TheBus: 16Doctors Community HospitalBus ShelterBidirectional TheBus: 16Princess Garden Parkway / Greenfield DriveEastboundPrincess Garden Parkway / Tiffany LaneWestboundPrincess Garden Parkway / Greenfield DriveEastboundPrincess Garden Parkway / #6512BidirectionalPrincess Garden Parkway / Woodburn CourtBidirectionalPrincess Garden Parkway / Hickory Hill AvenueBidirectionalPrincess Garden Parkway / City HallBidirectionalPrincess Garden Parkway / Annapolis RoadBidirectional Metrobus: B24, B27, F13, G14Annapolis Road / Princess Garden ParkwayWestbound Metrobus: B24, B27, F13, G14Annapolis Road / 85th AvenueBidirectional Metrobus: B24, B27, F13, G14Annapolis Road / Riverdale RoadBidirectional Metrobus: B24, B27, F4 (Eastbound only), F13, G14Annapolis Road / #7990Bidirectional Metrobus: B24, B27, F4, F13, G14Annapolis Road / West Lanham DriveBidirectional Metrobus: B24, B27, F4, F13, G14Harkins Road / Annapolis RoadBidirectional Metrobus: B24, B27, F4, F6, F13, G14, T18Harkins Road / Sherwood StreetBidirectional Metrobus: B24, B27, F4, F6, F13, G14, T18Harkins Road / Ellin RoadBidirectional Metrobus: B24, B27, F4, F6, F13, G14, T18New Carrollton stationBus Bay JWestbound terminalEastbound station Metrobus: A12, B21, B22, B24, B27, F4, F6, F12, F13, F14, G14, T14, T18 MTA Maryland Commuter Bus TheBus: 15X, 16, 21, 21X Greyhound Peter Pan Bus Lines Washington Metro: MARC: Penn Line Amtrak: Northeast Regional, Palmetto, Vermonter MTA: Purple Line (Planned)
Former G14 stops
Bus stopDirectionConnectionsPrince George's County, MarylandGreenbelt stationBus Bay FWestbound station,Eastbound terminal Metrobus: 89M, C2, G12, R12 RTA: 302/G TheBus: 11, 15X, 16 Shuttle-UM: 129 BoltBus Washington Metro: MARC: Camden LineGreenbelt Metro Drive / Cherrywood LaneBidirectional Metrobus: 89M, C2, G12, R12 RTA: 302/G TheBus: 11, 15, 16 Shuttle-UM: 129Cherrywood Lane / Springhill DriveBidirectional Metrobus: C2, R12 RTA: 302/G TheBus: 16Cherrywood Lane / Cherrywood CourtWestbound Metrobus: C2 RTA: 302/GCherrywood Lane / Breezewood DriveWestbound Metrobus: C2 RTA: 302/GCherrywood Lane / #5510Bidirectional Metrobus: C2, R12 RTA: 302/G TheBus: 16Greenbelt Road / Cherrywood LaneWestbound Metrobus: R12 RTA: 302/GBeltway Plaza / Cunningham Drive EntranceBidirectional Metrobus: R12Beltway Plaza / Main EntranceBidirectional Metrobus: R12Beltway Plaza / Cunningham Drive ExitBidirectional Metrobus: R12Greenbelt Road / 63rd AvenueBidirectional Metrobus: R12 RTA: 302/GGreenbelt Road / Edmonston RoadBidirectional Metrobus: R12 RTA: 302/GGreenbelt Road / Walker DriveBidirectional TheBus: 16Lakeside Drive / American Legion DriveEastbound Metrobus: G12Lakeside Drive / Lakecrest CircleWestbound Metrobus: G12Lakeside Drive / Lakecrest DriveBidirectional Metrobus: G12Lakeside Drive / WestwayBidirectional Metrobus: G12Westway / Ridge RoadBidirectional Metrobus: G12Ridge Road / 12 CourtBidirectional Metrobus: G12Ridge Road / 18 CourtEastboundRidge Road / 21 CourtBidirectionalRidge Road / GardenwayBidirectional Metrobus: G12Crescent Road / GardenwayBidirectional Metrobus: G12 TheBus: 11Southway / Crescent RoadBidirectional Metrobus: G12 TheBus: 11Southway / Ridge RoadEastbound TheBus: 11Southway / #7 CourtWestbound TheBus: 11Southway / #10 CourtEastbound TheBus: 11Southway / #11 CourtWestbound TheBus: 11Greenbelt Road / Greenway Shopping CenterBidirectional Metrobus: G12 TheBus: 11, 15X, 16 Shuttle-UMGreenbelt Road / Handover ParkwayBidirectionalGreenbelt Road / Frankfort DriveBidirectionalGreenbelt Road / Mandan RoadBidirectionalGreenbelt Road / Chelsea Road CondominiumBidirectionalGreenbelt Road / Gates of Cipriano CondosEastboundGreenbelt Road / Goddard RoadBidirectional TheBus: 15XGreenbelt Road / Vandenberg CourtBidirectionalGreenbelt Road / Good Luck RoadBidirectionalGreenbelt Road / Aerospace RoadBidirectionalGreenbelt Road / Woodland Landing ApartmentsBidirectionalGreenbelt Road / Forbes BoulevardBidirectionalMission Drive / Greenbelt RoadBidirectionalMission Drive / Goddard Corporate ParkBidirectionalMission Drive / Greenbelt RoadBidirectionalGreenbelt Road / Forbes BoulevardBidirectionalGreenbelt Road / Woodland Landing ApartmentsBidirectionalGreenbelt Road / Aerospace RoadBidirectionalGood Luck Road / Greenbelt RoadBidirectionalGood Luck Road / Forest Lake ApartmentsBidirectionalGood Luck Road / Palamar DriveBidirectionalGood Luck Road / Elvis LaneBidirectionalGood Luck Road / 97th PlaceBidirectionalGood Luck Road / 96th AvenueBidirectionalGood Luck Road / Presley RoadBidirectionalGood Luck Road / 94th AvenueBidirectionalGood Luck Road / Cipriano RoadWestboundCipriano Road / Tuckerman StreetBidirectionalCipriano Road / Wellington PlaceBidirectionalCipriano Road / 3rd StreetBidirectionalCipriano Road / Hickory Hill AvenueEastboundCipriano Road / 5th StreetEastboundCipriano Road / Spring AvenueEastboundCipriano Road / 7th StreetEastboundCipriano Road / 10th StreetBidirectionalLanham Severn Road / Cipriano RoadBidirectional Metrobus: B27Annapolis Road / Princess Garden ParkwayWestbound Metrobus: B24, B27, F13, G12Annapolis Road / 85th AvenueBidirectional Metrobus: B24, B27, F13, G12Annapolis Road / Riverdale RoadBidirectional Metrobus: B24, B27, F4 (Eastbound only), F13, G12Annapolis Road / #7990Bidirectional Metrobus: B24, B27, F4, F13, G12Annapolis Road / West Lanham DriveBidirectional Metrobus: B24, B27, F4, F13, G12Harkins Road / Annapolis RoadBidirectional Metrobus: B24, B27, F4, F6, F13, G12, T18Harkins Road / Sherwood StreetBidirectional Metrobus: B24, B27, F4, F6, F13, G12, T18Harkins Road / Ellin RoadBidirectional Metrobus: B24, B27, F4, F6, F13, G12, T18New Carrollton stationBus Bay JWestbound terminalEastbound station Metrobus: 87, A12, B21, B22, B24, B27, F4, F6, F12, F13, F14, G12, T14, T18 MTA Maryland Commuter Bus TheBus: 15X, 16, 21, 21X Greyhound Peter Pan Bus Lines Washington Metro: MARC: Penn Line Amtrak: Northeast Regional, Palmetto, Vermonter MTA: Purple Line (Planned)
History
The Greenbelt–New Carrollton Line was run by two different Metrobus routes from 1978 until 1993. The local routes were operated by routes T15, T16, and T17 from 1976 until 2010 while the Express routes were operated by the "Greenbelt-New Carrollton Express Line" operated by routes R11 and R15. After 1993, the line was solely operated by routes T15, T16, and T17. After the mid 2000s, routes T16 and T17 continued.
R11, R15
Routes R11 and R15 operated express routes during peak hours only between 1978 and 1993. Both routes operated during rush hours only.
Greenbelt–New Carrollton Express Line
Routes R11 and R15 originally began as Street Car Lines operating between Farragut Square and Springhill Lake Apartment Complex when they were a part of the Kenilworth Avenue Line. In 1973, both routes R11 and R15 became Metrobus routes along with routes R12, R13, and R14. On July 18, 1977, routes R11 and R15 were shorten to Stadium–Armory station. Early morning Saturday service was discontinued on September 26, 1977 being replaced with the Orange and Blue Lines with peak hour trips not being affected.