I think the difference is this covers road not even actually built. Many states have abandoned roads: https://en.wikipedia.org/wiki/List_of_unused_highways_in_t

I think the difference is this covers road not even actually built. Many states have abandoned roads: https://en.wikipedia.org/wiki/List_of_unused_highways_in_the_United_States https://en.wikipedia.org/wiki/List_of_unused_highways_in_the...