That wasn’t.

HIGHWAY CITY: Had Robert Moses’s ideas come to full fruition, an elevated highway would have cut through lower Manhattan at Broome Street, a mid-Manhattan version would have landed onto 30th Street, and the culture of Harlem’s 125th Street would have been eliminated by a Cross Harlem Expressway. The two uptown extensions died quickly, but Moses was so close to making LoMaX (the Lower Manhattan Expressway) that one segment, at Chrystie Street, was actually built and abandoned. (Via: Bowery Boys blog)