Looking on a map, I noticed I-670 stems off of 70, but it doesn’t connect back to it. It ends at a road (and US-64), but it does connect to I-270 right before it ends. Is this just an exception with the interstate numbering rules? Or does it connect back and I’m missing something?
Same with 470.
Edit: didn’t know there were more than one of these interstates! I’m talking about the ones near Columbus, Ohio. I guess I learned something new about that today too haha