The Eastover–Addison Road Line, designated Route P12, is a daily bus route operated by the Washington Metropolitan Area Transit Authority between the Addison Road station of the Blue & Silver Lines of the Washington Metro and Eastover Shopping Center in Forest Heights, Maryland.

[2] Washington Metro: Route P12 was created as a brand new bus route by the WM&A Bus Company in 1965, to operate as part of the District Heights-Silver Hill Road Line between the Eastover Shopping Center in Forest Heights, Maryland and the intersection of Shady Glen Drive and Central Avenue along Walker Mill Road.

The only changes route P12 would also have was that the P12 would operate along Central Avenue to Shady Glen Drive, then turn onto Shady Glen Drive to the Eastover Shopping Center and vice versa to Addison Road.

[10] This was because discontinuing service through United Medical Center property will save time and increase reliability, since buses will make fewer turns and will no longer get stuck behind illegally parked vehicles at the hospital entrance, swapping P12 and V12 routing on Walker Mill Road and Shady Glen Drive will provide a more direct route for the P12 as the V12 is already designed to be a more neighborhood-focused service, and splitting the P12 route at Southern Avenue Station will increase reliability and on time performance plus also provides the flexibility to focus future resources on the portions of the line with the highest demand.

Also, route P12 discontinued service into United Medical Center and instead serve bus stops along Southern Avenue.

This is due to a cease-and-desist complaint letter from the owner of Forest Hill Apartments.