Francis Scott Key wrote "The Star-Spangled Banner." However, the extension of the road to the fort was never built. A rail line ran the length of Key Highway, connecting to the tracks in Pratt Street via Light Street. A two-lane extension of the highway and rail line was built in 1930, branching off the old route east of Ludlow Street and running south under Fort Avenue to McComas Street. The short portion of the old road east of the extension is now East Key Highway; the rail tracks have been removed. Auxiliary routes MD 2A runs along an unnamed road from a dead end north to an intersection with MD 2/MD 4 in Lusby, Calvert County, where it continues as MD 765. The route is long. MD 2AB runs along an unnamed road from MD 778N east to MD 2 in Anne Arundel County. The route is long. MD 2AC runs along Monticello Drive from MD 2/MD 4 north to a cul-de-sac in Lusby, Calvert County. The route is long. MD 2AD runs along Solomons Island Road from the interchange with I-595/US 50/US 301/MD 2, where the road heads south as part of MD 2, north to Jennifer Road, where the road becomes Medical Parkway, in Annapolis, Anne Arundel County. The route is long. MD 2AE runs along Coster Mill Bridge Road from MD 2T/MD 2Z east to MD 2/MD 4 in Lusby, Calvert County. The route is long. MD 2AF runs along Nursery Road from MD 2/MD 4 east to MD 765P in Lusby, Calvert County. The route is long. MD 2AG runs along an unnamed road from MD 4, heading south before curving east under the Governor Thomas Johnson Bridge before ending at Solomons Island Road south in Solomons, Calvert County. The route is long. MD 2B runs along an unnamed road that parallels MD 2/MD 4 to the west, coming to dead ends on both ends and intersecting MD 2H along the way, in Lusby, Calvert County. The route is long. MD 2C runs along Henry Court from MD 2K north to a dead end in St. Leonard, Calvert County. The route is long. MD 2D runs along David Gray Road and Kingsberry Drive from a dead end north to a private driveway in St. Leonard, Calvert County, intersecting MD 2O. The route is long. MD 2E runs along an unnamed road that parallels MD 2/MD 4