I live in a city on the border of Alabama, and I-85 goes between the city and the neighboring one.
It's the accepted border when you go across the bridge, even though there's a few feet before the actual city limit into my city.
I-85 goes up to D.C.
I don't really know why I'm mentioning this.
I guess it's probably because the number's so close to the one you're on.
Even though they don't actually meet anywhere.