Oxon Hill–Suitland Line

D12, D14
Oxon Hill–Suitland Line
Route D14 at Suitland station
Overview
System	Metrobus
Operator	Washington Metropolitan Area Transit Authority
Garage	Andrews Federal Center (Daily) Shepherd Parkway (Select Peak-Hour Trips)
Livery	Local
Status	In Service
Route
Locale	Prince George's County, Maryland
Communities served	Eastover, Southlawn, Birchwood City, Oxon Hill, Camp Springs, Marlow Heights, Morningside, Camp Springs, Silver Hill, Suitland, Hillcrest Heights, Glassmanor, Forest Heights, Temple Hills
Landmarks served	Suitland station, Suitland Federal Center, Joint Base Andrews (D14), Camp Springs (D14), Marlow Heights Shopping Center (D12), Brinkley Road (D14), Haras Place (D14), Rivertowne Commons (D12), Oxon Hill, Southlawn (D14), Birchwood City (D12), Oxon Hill Park & Ride Lot (D14), Glassmanor (D12), Eastover, Southern Avenue station
Start	Suitland station
Via	Saint Barnabas Road (D12), Brinkley Road (D14), Allentown Road (D14), Indian Head Highway (D14)
End	Southern Avenue station
Length	60 minutes (D12) 70-80 minutes (D14)
Service
Level	Daily
Frequency	D12: 20 Minutes (7AM-9PM), 60 Minutes (After 9PM) D14: 24-30 Minutes (Peak Hours), 60 Minutes (All other times)
Operates	D12: 4:30 AM - 2:00 AM (Monday - Friday) 6:00 AM - 2:00 AM (Saturday - Sunday) D14: 4:12 AM - 11:35 PM (Monday - Friday) 5:30 AM - 11:30 PM (Saturday) 6:00 AM - 9:30 PM (Sunday)
Ridership	902,942 (D12, FY 2023)[1] 504,191 (D14, FY 2023)[1]
Timetable	Oxon Hill-Suitland Line (D12) Oxon Hill-Suitland Line (D14)
Route map ← D8  {{{system_nav}}}  E2 →

The Oxon Hill–Suitland Line, designated Routes D12 & D14, are daily bus routes operated by the Washington Metropolitan Area Transit Authority between Southern Avenue station and Suitland station of the Green Line of the Washington Metro. The D12 operates every 20 minutes between 7AM and 9PM and 60 minutes after 9PM while the D14 operates every 24–30 minutes during the peak hours and every 60 minutes all other times. Trips roughly take 60 minutes (D12) or 70–80 minutes (D14).

Routes D12 and D14 operate between Southern Avenue station and Suitland station mainly connecting riders along Saint Barnabas Road for the D12, and Brinkley Road, Allentown Road, and Indian Head Highway for route D14. Routes D12 and D14 operate daily. Route D14 follows much of the D12 routing except skipping the D12 routing along Audrey Lane, Deal Drive, Marcy Avenue and Livingston Terrace.

Routes D12 and D14 currently operate out of Andrews Federal Center garage full-time with select peak-hour trips operating out of Shepherd Parkway garage. The line formally operated out of Southern Avenue garage on weekdays and Shepherd Parkway on weekends.

Bus stop	Direction	Connections
Prince George's County, Maryland
Southern Avenue station Bus Bay P	Eastbound station, Westbound terminal	Metrobus: 32, A2, A32, D14, NH1, P12, P18, W1, W2, W14 TheBus: 33, 35, 37 Washington Metro:
Southern Avenue / #1380	Bidirectional	Metrobus: A2, D14, NH1, P12, W2 TheBus: 33, 35, 37
Southern Avenue / United Medical Center	Eastbound	Metrobus: A2, D14, NH1, P12, W2 TheBus: 33, 35, 37
Southern Avenue / Forest Hills Apartments	Westbound	Metrobus: A2, D14, NH1, P12, W2 TheBus: 33, 35, 37
Southern Avenue / 13th Street SE	Bidirectional	Metrobus: A2, D14, NH1, P12, P18, W2, W14 TheBus: 33, 35, 37
Southern Avenue / Wheeler Road	Bidirectional	Metrobus: A2, A6, A7, D14, NH1, P12 TheBus: 33, 35, 37
Southern Avenue / 9th Street SE	Bidirectional	Metrobus: A6, A7, D14, NH1, P12 TheBus: 33, 35, 37
Southern Avenue / Chesapeake Street SE	Bidirectional	Metrobus: A6, A7, D14, NH1, P12, P18, W14 TheBus: 33, 35, 37
Southern Avenue / Robert L. Yeldell Towers	Bidirectional	Metrobus: A6, A7, D14 TheBus: 33, 35, 37
Southern Avenue / Owens Road	Bidirectional	Metrobus: A6, A7, D14 TheBus: 33, 35, 37
Southern Avenue / Barnaby Street SE	Bidirectional	Metrobus: A6, A7, D14 TheBus: 35, 37
Southern Avenue / 6th Street SE	Bidirectional	Metrobus: A6, A7, A8, D14, P18, W14 TheBus: 35, 37
Southern Avenue / South Capitol Street	Westbound	Metrobus: A6, A7, A8, D14, P18, W14 TheBus: 35, 37
Indian Head Highway / Southern Avenue	Bidirectional	Metrobus: A6, A7, A8, D14, P18, W14 TheBus: 35, 37
Audrey Lane / Neptune Avenue	Bidirectional	Metrobus: P12
Audrey Lane / #632	Westbound	Metrobus: P12
Audrey Lane / Deal Drive	Eastbound	Metrobus: P12
Deal Drive / Audrey Lane	Westbound	Metrobus: P12
Deal Drive / Kennebec Street	Westbound	Metrobus: P12
Deal Drive / Dunster Drive	Bidirectional
Deal Drive / Marcy Avenue	Eastbound
Marcy Avenue / Neptune Avenue	Westbound
Marcy Avenue / Leverett Street	Eastbound
Livingston Terrace / #5501-#5507	Eastbound
Livingston Terrace / Livingston Road	Westbound
Livingston Road / Livingston Terrace	Westbound
Livingston Road / Shawnee Drive	Eastbound
Birchwood Drive / Livingston Road	Bidirectional
Birchwood Drive / Dunwoody Avenue	Bidirectional
Birchwood Drive / Fountain Road	Bidirectional
Birchwood Drive / Galloway Drive	Bidirectional
Birchwood Drive / Birchwood Court	Bidirectional
Birchwood Drive / Fenwood Avenue	Bidirectional
Helmont Drive / Fenwood Avenue	Bidirectional
Helmont Drive / Ironton Drive	Bidirectional
Helmont Drive / Clearview Avenue	Bidirectional
Helmont Drive / Dundalk Drive	Bidirectional
Galloway Drive / Fenwood Avenue	Bidirectional
Galloway Drive / Colony Road	Bidirectional
Livingston Road / Comanche Drive	Bidirectional
Livingston Road / Oxon Hill Road	Bidirectional	Metrobus: NH1, W14 TheBus: 35
Oxon Hill Road / Riverside Plaza Apartments	Bidirectional	Metrobus: NH1 TheBus: 35
Oxon Hill Road / #6188	Eastbound	Metrobus: NH1 TheBus: 35
Oxon Hill Road / Rivertowne Commons Market Place	Westbound	Metrobus: NH1 TheBus: 35
Oxon Hill Road / John Hanson Lane	Bidirectional	Metrobus: NH1 TheBus: 35
St. Barnabas Road / Alice Avenue	Bidirectional	Metrobus: NH1
Silver Hill Road / Larry Avenue	Eastbound	Metrobus: NH1
St. Barnabas Road / Rosecroft Village Drive	Westbound	Metrobus: NH1
St. Barnabas Road / #5401	Westbound	Metrobus: NH1
St. Barnabas Road / Arts Drive	Eastbound	Metrobus: NH1
St. Barnabas Road / Wheeler Road	Westbound	TheBus: 33
St. Barnabas Road / Winston Street	Eastbound	TheBus: 33
St. Barnabas Road / Frazier Terrace	Bidirectional	TheBus: 33
St. Barnabas Road / St. Barnabas Church	Westbound	TheBus: 33
St. Barnabas Road / Frazier Drive	Eastbound	TheBus: 33
St. Barnabas Road / Lime Street	Westbound	TheBus: 33
St. Barnabas Road / Kernal Lane	Eastbound	TheBus: 33
St. Barnabas Road / Hagan Road	Bidirectional	TheBus: 33
St. Barnabas Road / Temple Lane	Bidirectional	TheBus: 33
St. Barnabas Road / Temple Hill Road	Eastbound	Metrobus: H12 TheBus: 32, 33
St. Barnabas Road / Raleigh Road	Westbound	Metrobus: H12 TheBus: 32, 33
St. Barnabas Road / Pohanka Place	Bidirectional	Metrobus: H12
St. Barnabas Road / Clifton Road	Bidirectional	Metrobus: H12
St. Barnabas Road / Stamp Road	Bidirectional	Metrobus: H12
St. Barnabas Road / Holly Tree Road	Eastbound	Metrobus: H12
St. Barnabas Road / Leisure Drive	Westbound	Metrobus: H12
St. Barnabas Road / 28th Avenue	Westbound	Metrobus: H12
28th Avenue / St. Barnabas Road	Bidirectional	Metrobus: C12, C14, H12
28th Avenue / Riviera Street	Bidirectional
28th Avenue / #4219	Bidirectional
28th Avenue / St. Clair Drive	Bidirectional	Metrobus: H12 TheBus: 32
28th Avenue / Keith Street	Bidirectional	Metrobus: H12 TheBus: 32
Keith Street / Triton Court	Bidirectional	Metrobus: H12
Marlow Heights Shopping Center / #3927	Bidirectional	Metrobus: C12, C14, H12
Marlow Heights Shopping Center / Macy's	Bidirectional	Metrobus: C12, C14, H12
Marlow Heights Shopping Center / 28th Avenue	Bidirectional	Metrobus: C12, C14, H12
St. Barnabas Road / Bedford Way	Bidirectional	Metrobus: C12, C14
St. Barnabas Road / Wilkinson Drive	Bidirectional
St. Barnabas Road / Silver Hill Road	Bidirectional	Metrobus: P12
Silver Hill Road / Silver Park Drive	Bidirectional	Metrobus: P12
Silver Hill Road / Terrace Drive	Bidirectional	Metrobus: P12
Silver Hill Road / Maywood Lane	Bidirectional	Metrobus: P12
Suitland Station Roadway / Suitland Federal Center	Eastbound	Metrobus: D14, K12, P12, V12 TheBus: 34
Suitland station Bus Bay H	Westbound station, Eastbound terminal	Metrobus: D14, K12, P12, V12 TheBus: 34 MTA Maryland Bus: 735, 850 Washington Metro:

Bus stop	Direction	Connections
Prince George's County, Maryland
Southern Avenue station Bus Bay Q	Eastbound station, Westbound terminal	Metrobus: 32, A2, A32, D12, NH1, P12, P18, W1, W2, W14 TheBus: 33, 35, 37 Washington Metro:
Southern Avenue / #1380	Bidirectional	Metrobus: A2, D12, NH1, P12, W2 TheBus: 33, 35, 37
Southern Avenue / United Medical Center	Eastbound	Metrobus: A2, D12, NH1, P12, W2 TheBus: 33, 35, 37
Southern Avenue / Forest Hills Apartments	Westbound	Metrobus: A2, D12, NH1, P12, W2 TheBus: 33, 35, 37
Southern Avenue / 13th Street SE	Bidirectional	Metrobus: A2, D12, NH1, P12, P18, W2, W14 TheBus: 33, 35, 37
Southern Avenue / Wheeler Road	Bidirectional	Metrobus: A2, A6, A7, D12, NH1, P12 TheBus: 33, 35, 37
Southern Avenue / 9th Street SE	Bidirectional	Metrobus: A6, A7, D12, NH1, P12 TheBus: 33, 35, 37
Southern Avenue / Chesapeake Street SE	Bidirectional	Metrobus: A6, A7, D12, NH1, P12, P18, W14 TheBus: 33, 35, 37
Southern Avenue / Robert L. Yeldell Towers	Bidirectional	Metrobus: A6, A7, D12 TheBus: 33, 35, 37
Southern Avenue / Owens Road	Bidirectional	Metrobus: A6, A7, D12 TheBus: 33, 35, 37
Southern Avenue / Barnaby Street SE	Bidirectional	Metrobus: A6, A7, D12 TheBus: 35, 37
Southern Avenue / 6th Street SE	Bidirectional	Metrobus: A6, A7, A8, D12, P18, W14 TheBus: 35, 37
Southern Avenue / South Capitol Street	Westbound	Metrobus: A6, A7, A8, D12, P18, W14 TheBus: 35, 37
Indian Head Highway / Southern Avenue	Bidirectional	Metrobus: A6, A7, A8, D12, P18, W14 TheBus: 35, 37
Indian Head Highway / Audrey Lane	Bidirectional	Metrobus: P12, P18, W14 TheBus: 35, 37
Indian Head Highway / Talbert Drive	Eastbound	Metrobus: P18, W14 TheBus: 37
Indian Head Highway / Livingston Road	Westbound	Metrobus: P18, W14 TheBus: 37
Indian Head Highway / Seneca Drive	Eastbound	Metrobus: P18, W14 TheBus: 37
Indian Head Highway / Tecumseh Drive	Eastbound	Metrobus: P18, W14 TheBus: 37
Indian Head Highway / I-95, I-495	Westbound	Metrobus: P18, W14 TheBus: 37
Oxon Hill Park & Ride Lot Bus Bay C	Bidirectional	Metrobus: NH1, NH2, P18 TheBus: 35, 35S
Oxon Hill Road / Harborview Avenue	Bidirectional	Metrobus: NH1, NH2, P18 TheBus: 35, 35S
Oxon Hill Road / Oxon Hill Manor	Southbound	Metrobus: P18 TheBus: 35S
Oxon Hill Road / Tanger Outlets Main Entrance	Northbound	Metrobus: P18 TheBus: 35S
Oxon Hill Road / Pipers Glen Lane	Southbound	Metrobus: P18
Oxon Hill Road / Brockton Road	Northbound	Metrobus: P18
Oxon Hill Road / Abbington Drive	Bidirectional	Metrobus: P18
Oxon Hill Road / Claudia Drive	Bidirectional	Metrobus: P18
Indian Head Highway Service Road / Wilson Towers Apartments	Bidirectional	TheBus: 37
Livingston Road / Murray Hill Drive	Westbound
Livingston Road / #7916	Eastbound
Livingston Road / Carey Branch Drive	Eastbound
Livingston Road / Hart Road	Bidirectional
Livingston Road / Elwin Road	Bidirectional
Livingston Road / Broderick Drive	Westbound
Livingston Road / Busit Avenue	Eastbound
Livingston Road / White Oak Drive	Bidirectional
Lindsay Road / Jarrett Avenue	Bidirectional
Lindsay Road / Wilmette Drive	Eastbound
Leyte Drive / Lindsay Road	Westbound
Leyte Drive / #6902	Eastbound
Leyte Drive / #6903	Westbound
Leyte Drive / Shelby Drive	Bidirectional
Wentworth Drive / Haven Avenue	Bidirectional
Wentworth Drive / #1123	Westbound
Wentworth Drive / Devonshire Drive	Eastbound
Wentworth Drive / Westfield Drive	Westbound
St. Barnabas Road / Tucker Road	Bidirectional
St. Barnabas Road / Bock Road	Bidirectional	Metrobus: W14 TheBus: 35
St. Barnabas Road / Careyhurst Drive	Bidirectional	TheBus: 35
St. Barnabas Road / Barrowfield Road	Bidirectional	TheBus: 35
St. Barnabas Road / John Hanson Lane	Eastbound	TheBus: 35
Brinkley Road / John Hanson Lane	Westbound	TheBus: 35
Brinkley Road / St. Ignatius Drive	Bidirectional	TheBus: 35
Brinkley Road / #2505	Eastbound	TheBus: 35
Brinkley Road / Kildare Court	Westbound	TheBus: 35
Glen Rock Avenue / Brinkley Road	Bidirectional
Glen Rock Avenue / Corning Avenue	Bidirectional
Everhart Place / Corning Avenue	Bidirectional
Everhart Place / Henson Creek Manor	Bidirectional
Glen Rock Avenue / Corning Avenue	Bidirectional
Glen Rock Avenue / Brinkley Road	Bidirectional
Brinkley Road / Brinkley Crest Townhouses	Bidirectional	TheBus: 33, 35
Brinkley Road / Huntcrest Condos	Bidirectional	TheBus: 33, 35
Brinkley Road / Huntley Square Drive	Eastbound	TheBus: 33, 35
Brinkley Road / Arbor View Apartments	Westbound	TheBus: 33, 35
Brinkley Road / Cherryfield Road	Eastbound	TheBus: 33, 35
Brinkley Road / Roberts Drive	Westbound	TheBus: 33, 35
Brinkley Road / Middlefield Road	Eastbound	TheBus: 33, 35
Brinkley Road / Morton Place	Westbound	TheBus: 33, 35
Brinkley Road / Trude Street	Bidirectional	TheBus: 33, 35
Brinkley Road / Farmer Drive	Bidirectional	TheBus: 33, 35
Brinkley Road / Temple Hill Road	Bidirectional	TheBus: 32, 33, 35
Temple Hill Road / Cardwell Drive	Bidirectional	TheBus: 33
Temple Hill Road / Farmer Drive	Bidirectional	TheBus: 33
Allentown Road / Temple Hill Road	Bidirectional	TheBus: 30, 33, 35, 37
Allentown Road / #7052	Bidirectional	TheBus: 30, 33, 35, 37
Allentown Road / Waldran Avenue	Bidirectional	TheBus: 30, 33, 35, 37
Allentown Road / Karen Anne Drive	Southbound	TheBus: 30, 33, 35, 37
Allentown Road / Kingston Drive	Bidirectional	TheBus: 30, 33, 35, 37
Allentown Road / Westchester Drive	Eastbound	TheBus: 30, 33, 35, 37
Allentown Road / Westchester Court	Bidirectional	TheBus: 30, 33, 35, 37
Allentown Road / Coolridge Road	Bidirectional	TheBus: 30, 33, 35, 37
Allentown Road / Brinkley Road	Bidirectional	TheBus: 30, 32, 33, 35, 37
Allentown Road / Allentown Way	Eastbound	Metrobus: C11, C13 TheBus: 30, 33, 37
Old Branch Avenue / Allentown Way	Bidirectional (Short trips only)	Metrobus: C11, C13 TheBus: 30, 32, 33, 37
Allentown Way / Old Branch Avenue	Bidirectional terminal (Short trips only)	Metrobus: C11, C13 TheBus: 30, 32, 33, 37
Allentown Way / #5816	Bidirectional (Short trips only)
Allentown Road / Perrie Lane	Bidirectional	TheBus: 30
Allentown Road / Robin Lane	Westbound	TheBus: 30
Allentown Road / Leon Street	Eastbound	TheBus: 30
Allentown Road / #5711	Bidirectional	TheBus: 30
Allentown Road / Maxwell Drive	Westbound	Metrobus: K12 TheBus: 30
Allentown Road / Command Drive Joint Base Andrews (West Gate)	Bidirectional	Metrobus: K12
Allentown Road / Andrews Manor Shopping Center	Bidirectional	Metrobus: K12
Allentown Road / Suitland Road	Westbound	Metrobus: K12
Suitland Road / Allentown Road	Eastbound	Metrobus: K12
Suitland Road / Lou Lane	Eastbound
Suitland Road / Tournament Street	Westbound
Suitland Road / Marianne Drive	Eastbound
Suitland Road / Popular Road	Bidirectional
Suitland Road / Randolph Road	Bidirectional
Suitland Road / Pine Line Drive	Eastbound
Suitland Road / Skyline Terrace	Westbound
Suitland Road / John Street	Westbound
Suitland Road / Skyline Drive	Eastbound
Suitland Road / Woodland Road	Bidirectional
Suitland Road / Kingswood Drive	Eastbound
Suitland Road / #5829-#5897	Westbound
Suitland Road / Rock Quarry Terrace	Eastbound
Suitland Road / Regency Park Court	Westbound
Suitland Road / Regency Parkway	Bidirectional
Regency Parkway / Rock Quarry Terrace	Eastbound
Regency Parkway / Stoney Meadows Drive	Westbound
Regency Parkway / Andrew Jackson Middle School	Bidirectional
Regency Lane / #5745	Bidirectional
Hil Mar Drive / Monacco Court	Bidirectional
Hil Mar Drive / Princess Caroline Court	Bidirectional
Hil Mar Drive / Little Hill Lane	Eastbound
Hil Mar Drive / Round Hill Lane	Westbound
Suitland Road / Belgreen Street	Bidirectional
Suitland Road / Romain Court	Bidirectional
Suitland Road / Eastern Lane	Bidirectional
Suitland Road / Silver Hill Road	Eastbound	Metrobus: K12, P12, V12 TheBus: 34
Silver Hill Road / Suitland Road	Eastbound	Metrobus: K12, P12, V12 TheBus: 34
Silver Hill Road / Swann Road	Bidirectional	Metrobus: K12, P12, V12 TheBus: 34
Silver Hill Road / Randall Road	Bidirectional	Metrobus: K12, P12, V12 TheBus: 34
Silver Hill Road / Parkway Terrace Drive	Westbound	Metrobus: K12, P12, V12 TheBus: 34
Suitland Station Roadway / Suitland Federal Center	Eastbound	Metrobus: D12, P12, K12, V12 TheBus: 34 MTA Maryland Bus: 735, 850
Suitland station Bus Bay J	Westbound station, Eastbound terminal	Metrobus: D12, K12, P12, V12 TheBus: 34 MTA Maryland Bus: 735, 850 Washington Metro:

Routes D12 and D14 was originally operated under the Washington Marlboro & Annapolis Motor Lines Inc. (WM&A) which operated between Eastover Shopping Center and Downtown Washington DC beginning in 1945 (D14) and 1948 (D12). The line was connected via South Capitol Street towards Downtown (11th and E Streets NW). Route D12 originally was named Route D while route D14 was originally named Route M. In 1953 WM&A adopted letter designations for its routes with new routes D12 and D14.^[2] In 1973, routes D12 and D14 were acquired by WMATA when they acquired the WM&A.^[3]

Later, route D14 would be eliminated, but a new route S12 would be introduced to operate alongside the D12. Route S12 would operate between Southview apartments and Federal Center station while route D12 operate between Marlow Heights and Federal Center station. At the time, the line was run as the Eastover–Marlow Heights Line.

On November 21, 1978, both routes D12 and S12 were shorten to operate between Eastover Shopping Center and Federal Center station. S12 service between Southview Apartments and Eastover was replaced by route P12.^[4]

On January 3, 2000, new boarding and alighting restrictions were implemented on route D12. During the AM rush, passengers can get on and off any southbound D12 bus going to Marlow Heights at any bus stop in Maryland and the District of Columbia with restrictions for northbound buses not changing. Passengers can get on and off the bus in Maryland but only get off the bus at stops in the District of Columbia.^[5]

During the PM rush, passengers can get on and off northbound buses going to Federal Center SW at any bus stop in Maryland and the District of Columbia with southbound restrictions not changing. Passengers can only get on the bus in the District of Columbia, and get on or off the bus at any stop in Maryland.

On January 13, 2001, when the Green Line extension to Branch Avenue station opened, route D12 was rerouted to operate between Suitland station and Southern Avenue station mainly operating along Saint Barnabas Road, Oxon Hill Road, Indian Head Highway, and Southern Avenue. Buses were also rerouted via 28th Avenue and Keith Street (behind Marlow Heights Shopping Center) and extended from the shopping center to the Suitland station via Branch Avenue and Saint Barnabas and Silver Hill roads.^[6]

Routes W11 and W12 from the Eastover–Indian Head Highway Line were also rerouted to operate alongside the D12 between Southern Avenue and Suitland stations and were renamed into routes D13 (W11) and D14 (W12). The line would mainly operate along Suitland Road, Allentown Road, Brinkley Road, Livingston Road, Indian Head Highway, and Southern Avenue. The line also operated via Andrews Air Force Base, as well as the Camp Springs, Temple Hills, and Glassmanor neighborhoods, which former Routes W11, W12, and W17 originally operated on between the Federal Center SW station and Acokeek.^[6]

All route S12 service was eliminated in the process being replaced by route D12, and P12.^[6]

In 2010 during WMATA's FY2011 budget, WMATA proposed to divert routes D13 and D14 into Oxon Hill Park & Ride Lot off Oxon Hill Road just west of Indian Head Highway in order to create a transfer connection between those routes and the NH1, which serves National Harbor. This would provide closer connections to National Harbor for passengers instead of having to take the Green Line to Branch Avenue station.^[7]

Beginning on October 15, 2019, for two years, eastbound D13 and D14 buses were forced to detour due to the Maryland State Highway Administration’s Maryland Route 210 Interchange Project. This prevents buses from turning left from Indian Head Hwy - MD 210 onto Livingston Road. As a result, routes D13 and D14 were forced to backtrack along Indian Head Highway detouring on Wilson Bridge Drive, before resuming its regular route Lindsay Rd at Livingston Rd. A temporary time transfer was also implemented for affected passengers at closed bus stops westbound. Westbound buses were unaffected by the detour.^[8][9]

During the COVID-19 pandemic, route D13 was suspended and routes D12 and D14 was reduced to operate on its Saturday supplemental schedule during the weekdays beginning on March 16, 2020.^[10] On March 18, 2020, the line was further reduced to operate on its Sunday schedule.^[11] On March 21, 2020, weekend service on the D14 became suspended and Route D12 was reduced to operate every 30 minutes.^[12] Service was restored to its full service on August 23, 2020.^[13]

In February 2021 during the FY2022 budget, WMATA proposed to eliminate Routes D13 and D14, and propose to extend the D12 to National Harbor to replace the NH1 and eliminate service between Southern Avenue station and Livingston Road & Oxon Hill Road if it did not receive federal funding.^[14] However the changes were avoided on March 10, 2021.

Beginning on June 15, 2021, eastbound routes D13 and D14 resumed its regular routing on Livingston Road following the completion of the Maryland State Highway Administration's Maryland Route 210 Interchange Project.^[15]

On September 5, 2021, all Route D13 service was renamed to the D14 while D14 service along Livingston Road, Livingston Terrace, Marcy Avenue, Deal Drive, Kennebec Street, Glassmanor Drive, Irvington Street, and Audrey Lane in Glassmanor was eliminated. Service was replaced by Routes D12 and P12 which increased service to every 12 (P12) and 20 (D12) minutes. Between Wilson Bridge Drive and the intersection of Indian Head Highway & Oxon Hill Road, service will operate along Kirby Hill Road and Oxon Hill Road, adding service at Oxon Hill Park & Ride. Service will continue to Wilson Bridge Drive.^[16]