The Harlem River Drive, officially designated the 369th Harlem Hellfighters Drive, is a 4.20-mile (6.76 km) long north–south parkway in the New York City borough of Manhattan. It runs along the west bank of the Harlem River from the Triborough Bridge in East Harlem to 10th Avenue in Inwood, where the parkway ends and the road continues north as Dyckman Street. The portion of the Harlem River Drive from the Triborough Bridge to the Alexander Hamilton Bridge is a limited-access highway. South of the Triborough Bridge, the parkway continues toward lower Manhattan as FDR Drive. All of the Harlem River Drive is designated New York State Route 907P (NY 907P), an unsigned reference route. The parkway opened to traffic in 1964. The parkway's ceremonial designation is in honor of the 369th Infantry Regiment, also known as the Harlem Hellfighters.