The purpose of this extension was to give motorists a "more direct bypass of the New York City area" to New England, by using the Tappan Zee Bridge. The extension was to parallel New York State Route 303 (NY 303) and the present-day CSX River Subdivision, and have limited interchanges. It was to have an interchange with the Palisades Interstate Parkway and at I-87 (New York State Thruway) in West Nyack. This project did not survive; by 1970, it became too expensive to buy right-of-way access, and community opposition was fierce. Therefore, the New Jersey Turnpike Authority and the New York State Thruway Authority cancelled the project. The New Jersey Department of Transportation did construct a small segment of this extension, the portion between US 46 and Interstate 80, as part of the I-95 Extension. This segment was later transferred to the New Jersey Turnpike Authority.