English: A cropped highway map from the 1964 NYC Parks Department book, "30 years of progress", highlighting the planned routing of Interstate 78 in Brooklyn, and Southern Queens. Highlighted in red are the proposed but unbuilt portions of the route. In black are the portions of the route which were completed or partially built, and are now operated as separate highways.

The sections are from left-to-right (west to east) or counterclockwise:
1. Williamsburg Bridge (built) - crosses East River between Lower East Side, Manhattan and Williamsburg, Brooklyn.
2. Bushwick Expressway (unbuilt) - as mapped, would run west-to-east across northern/central Brooklyn via Wyckoff Avenue; alternate route would have run via Bushwick Avenue.
3. Conduit Boulevard/Conduit Avenue (built as an arterial road as part of NY 27 Sunrise Highway; expressway unbuilt) - expressway would have been built in boulevard median, connecting Bushwick Expressway and Nassau Expressway.
4. Nassau Expressway (partially built) - Runs between Cross Bay Boulevard in Howard Beach, Queens, and Springfield Gardens along northern boundary of JFK Airport. Only eastbound lane built between Cross Bay and Van Wyck Expressway (I-678).
5. Nassau Expressway extension/connector (unbuilt) - Expressway connection between current sections of the highway in Queens and Nassau County, along or parallel to Rockaway Boulevard. Not part of I-78.
6. Clearview Expressway Extension (unbuilt) - Southern extension of Clearview Expressway through Southeast Queens to connect with Nassau Expressway and JFK Expressway.

7. Clearview Expressway (built; now I-295) - runs north of Hillside Avenue towards Throgs Neck Bridge. Continues in the Bronx as Cross Bronx Expressway extension towards Bruckner Interchange.