The Butternut Interchange, where I-690 connects with Interstate 481 in the town of DeWitt, includes a pair of unused ramps and grading for additional connections with the unconstructed relocation of New York State Route 5. A 1965 proposal for a bypass of Fayetteville outlined a corridor extending southeast from I-690 and then I-281 along the right of way of the New York Central Railroad, Chenango branch to Route 92 at point near Oran.⁹ The Fayetteville Bypass was advanced by state officials at a luncheon on March 17, 1967, but without a tentative timetable. Coupled with a proposal to relocate Route 92 to the south of Manluis, the realignment of Route 5 was roughly projected to follow the old Erie Canal east.¹⁰ Ultimately neither Route 5, nor the four to six lane highway envisioned for Route 92 east from the Jamesville interchange with I-481 were constructed. Source: https://www.interstate-guide.com/i-690-ny/

While those are interesting connections how they are hooked into the interchange, I could see how this could become a weaving problem.