As part of the planning for an east–west route through Baltimore, the alignment of the JFX underwent various modifications. Under the original plan for freeways in Baltimore, the 1962 "Baltimore 10-D Interstate System", the JFX would have junctioned I-70N (which became I-70 in 1975) and I-95, which were planned to follow an east–west route through the southern edge of the central business district (CBD), near the southeastern edge of the CBD. The JFX would end at roughly the same location where it currently does. As a result of community opposition to other portions of the 10-D System, the 1969 "Baltimore 3-A Interstate and Boulevard System" was adopted by the city. In this plan, the JFX would continue south along its present alignment, then turn east and pass through the Fells Point neighborhood on a 6-lane elevated viaduct, before continuing east along Boston Street to junction I-95 (which was also rerouted to its current alignment) north of the Fort McHenry Tunnel. In the mid-1970s, this plan was modified due to fears that the viaduct would result in destruction of the Fells Point area, which contains many historic properties. Under the modification, I-83 would continue south and descend into a 6-lane underwater tunnel beneath the Inner Harbor, then turn east under the Harbor, pass to the south of Fells Point, return to the surface in the Canton area and continue to I-95.