The long section of the Sprain Brook Parkway was opened on November 27, 1969 from Jackson Avenue in Greenburgh to the Cross Westchester Expressway in Elmsford. This new section of Sprain Brook Parkway cost $15.4 million, extending the parkway to a length of from the Bronx to Elmsford. This also included an interchange with NY-100B in Greenburgh. An additional exit was planned at Ardsley Road to provide access to Scarsdale, Ardsley, and Dobbs Ferry, but was never built. Then-Governor of New York Nelson Rockefeller also noted that the extension of the parkway north from the Cross Westchester to the Hawthorne Traffic Circle was still in final design and would begin construction in 1971 with completion of a new interchange in Hawthorne.