("East River Drive" redirects here. For East Drive in Central Park, see East Drive (Manhattan).) The FDR Drive (officially referred to as the Franklin D. Roosevelt East River Drive, and sometimes known as the FDR) is a 9.44-mile (15.19 km) freeway-standard parkway on the east side of the New York City borough of Manhattan. It starts just north of the Battery Park Underpass at South and Broad Streets and runs along the entire length of the East River, from the Battery Park Underpass under Battery Park – north of which it is the South Street Viaduct – north to 125th Street / Robert F. Kennedy Bridge / Willis Avenue Bridge interchange, where it becomes the Harlem River Drive. All of the FDR Drive is designated New York State Route 907L (NY 907L), an unsigned reference route.