Widest/longest roads with an uncommon suffix?

[US 89]

In KC, there is a road called SW Trafficway.

[empirestate]

There is also Alligator Alley in Florida.  How many alleys are 80 miles long and carry an Interstate designation?

That reminds me, didn't we have a thread or two that attempted to define road suffix types? That is, an "avenue" has such-and-such characteristics, as opposed to a "boulevard" or "drive", which has so-and-so?

Because I think we can all agree that an "alley" is narrower than a road or street, and is used to provide access between or behind urban buildings or city blocks.