Originally conceived and constructed under the auspices of Robert Moses, the twin tunnels have been superseded by the Trans-Manhattan Expressway in Washington Heights, which itself runs through a cut with high-rise apartments built over it in places.The eastern end split into two directions: a ramp to Amsterdam Avenue on the right and a 1,000-foot-long (300 m) driveway south to the Harlem River Drive on the left.[4] After delays related to the construction of the Harlem River Drive ramp,[5] the 178th Street Tunnel opened on June 27, 1940, serving both directions of traffic.[2] Due to labor shortages and low traffic during World War II, the tunnel was closed in May 1942, reopening in November 1945.A study was completed, in which the tunnels would be rehabilitated and reused temporarily for traffic diverted from a reconstruction of the Trans-Manhattan Expressway and the Alexander Hamilton Bridge.
One of the tunnels under the Bronx-George Washington Bridge in 1952