The Glover Park–Franklin Square Line, designated Route D1, was a weekday peak hour bus route operated by the Washington Metropolitan Area Transit Authority between Glover Park and Franklin Square.

Two new buses will be scheduled to leave eastbound from Glover Park at 9:05 a.m. and westbound from Federal Triangle at 7:05 p.m.

In 2015, WMATA proposed to eliminate the D1 segment between Franklin Square and Federal Triangle as the portion suffers from low ridership.

[5] On June 26, 2016, route D1 was shortened even further from Federal Triangle to Franklin Square due to low ridership.

[11][12] The proposed elimination was brought back up on September 26, 2020 due to low federal funding.