They ran out of Interstate numbers in the 1980s and other states started cannibalizing New York State interstate numbers … 🛣️

• Interstate 84 – Oregon/Utah
• Interstate 86 – Idaho
• Interstate 87 – North Carolina
• Interstate 88 – Illinois

No other state besides New York State has ever had their interstate numbers cannibalized.

There are no repeats in interstate numbering from Interstate 2 to Interstate 83 or Interstate 89 to Interstate 99, although currently New York I-99 and Pennsylvania I-99 contains about a fifty mile gap that will be eventually completed.