For the record, there was an article in Forbes that graphically portrayed various transportation corridors and means tho indicate those carrying the most freight.
I 81 carries the most freight of any interstate hiway
What I 81 most needs is three or four laning through Virginia
I agree. However, don't hold your breath. Thanks in part to Civil War preservation buffs and the usual NIMBYs and enviros, this may not happen until [censored] sticks to the moon.