Complex sentence: On May 25,2016, AASHTO instead approved I-87 as the number for the highway, which would be non-contiguous with the route with the same number in New York State.
Split into simpler sentences: On May 25,2016, AASHTO instead approved I-87 as the number for the highway. The new I-87 would be non-contiguous with the route with the same number in New York State.