Thought of two questions with enhanced mile markers.
- What is the longest interstate that uses an enhanced mile marker in every state it goes through (MM doesn't have to be continuous all the way)?
- What is the longest interstate that doesn't use any enhanced mile markers (or in other words, doesn't have a mile marker with its route shield on it) at all?
For the first, I know I-75 uses enhanced mile markers in every state it passes through. Not sure about the interstates longer than I-75 in some states they pass through.
I imagine the answer for the second one would be an x5 out west, but I'm not sure exactly which one, or if there are lone enhanced mile markers that I'm not aware of.