The architect Robert Stern once remarked, "Can you imagine an elevated expressway at 30th Street just so Long Island guys could get to New Jersey?" Robert Moses could. A pair of Google Maps of Manhattan were redrawn to include the Lower Manhattan Expressway and Mid Manhattan Expressway, two highways masterminded by Moses that would have cut across Manhattan through Soho and at 30th St., respectively.
This was true for me, at least, while I was making these; Hand erasing buildings through SoHo, TriBeCa, and the LES was an eery experience as I tried to imagine what these places would really look like if my brush was a bulldozer.
More information on the Mid-Manhattan Expressway and the Lower Manhattan Expressway on NYCroads. (via migurski)