ashleyelll reblogged your post: Interesting but useless facts:
whhhhy do we have a 91 freeway that runs east & west!?
The short (and confusing) answer is that all Interstates are Freeways, but not all Freeways are Interstates. Examples: California 91, California 99, California 60 – Freeways that are merely State Roads (what up, Cali?)
Think of it this way: A freeway, by definition, does not have tolls. An Interstate may have tolls. Some do. Most do not