I would like to see I-50 in place of an I-x65. Allow me to give some reasons I believe this.
1. There isn't a KY 50. US 50 does not enter Kentucky. This can allow Kentucky to possibly apply for an I-50 designation along the Cumberland Parkway.
2. Where else could an I-50 be used? Nowhere else in the grid except maybe if US 58 in Virginia or if the US 158 corridor in North Carolina were ever upgraded to Interstate status, however unlikely.
3. By using I-50, it gives the highway a bit of "status", instead of it being just a spur of I-65.
If I-50 were to become reality, as of now it would be 88 miles long--currently ending at US 27 north of Somerset. However, with the planned extension of the Cumberland Parkway possibly out to the KY 80-KY 461 intersection, I-50 could be designated at least to that point. And if KYTC ever decided to upgrade the KY 80 corridor the rest of the way to I-75 in London, I-50 could be used. This would make I-50 approximately 120 miles.
Now I know that X0 Interstate highways are usually reserved for major east-west freeways. However, as I stated above, where else could an I-50 be designated? Unless there was a major Interstate beginning in someplace like Hayti, MO, using current I-155, the US 51/future I-69 freeway to Fulton or Mayville, KY, then new construction in southern Kentucky and southern Virginia (or northern North Carolina), there is no clear-cut highway to place an I-50 on with the exception of the Cumberland Parkway.
Comments and opinions are most welcome. Thanks in advance.