River Parkway was extended southward from US 1 in Pelham Manor to Pelham Bay Park in the Bronx. The new highway became part of NY 1A, which was rerouted through the Bronx to follow Bruckner Boulevard and Shore Road to Pelham Bay Park. From there, NY 1A followed the parkway north to a new terminus at US 1 just north of the city line. A second southward extension of the parkway from Pelham Bay Park to NY 1A at the Bruckner Interchange opened in 1941. The new road was originally designated as NY 1X; however, the NY 1X designation was replaced with a rerouted NY 1A in 1946. The Willis Avenue Bridge became one-way northbound on August 5, 1941, and the Third Avenue Bridge became one-way southbound. Southbound NY 1A was thus rerouted along Lincoln Avenue, 135th Street, and Third Avenue onto the bridge, and 128th Street, Second Avenue and 122nd Street to return to First Avenue. A direct connection from Southern Boulevard to the Third Avenue Bridge was later built. On June 4, 1951, First and Second Avenues were made into a one-way pair north of Houston Street, moving northbound NY 1A south of 23rd Street and southbound NY 1A between 23rd Street and 122nd Street. The NY 1A designation was completely removed . Major intersections See also U.S. Route 1 Business (now Route 139), which continued NY 1A back to its parent in Jersey City, New Jersey References External links 001A A New York Transportation in Manhattan Transportation in the Bronx Transportation in Westchester County, New York