New Jersey Route 4, which connected directly to the bridge's western end, opened in July 1932. The 178th-179th Street Tunnels, which connected Amsterdam Avenue on the eastern side of Manhattan to the bridge's eastern end on the west side of Manhattan, were supposed to be completed in late 1932. Direct approaches to Riverside Drive and the Hudson River Parkway were completed in 1937, and the tunnels were completed in 1938–1939. A ramp eastward from the bridge and southward to the Harlem River Drive was also completed around this time. On the New Jersey side, state highways were also being modernized to handle bridge traffic. The bridge's westbound entrance ramp from Fort Washington Avenue, at the top of the cliff on the Manhattan side, opened in April 1939. The corresponding eastbound exit ramp, as well as the 178th-179th Street Tunnels, opened in June 1940.