with growth in nashville and increasing truck traffic on I-40, there should be truck only lanes separated from regular car and rv traffic from memphis to nashville at the very least. i say this because nashville has recently become a center of industry as of late, with major mega corporations making their homes in Tennessee, especially around nashville.
memphis has industry thats dying rn, im afraid to admit it, which is due to local policy and high crime, most of memphis industry is moving from memphis to south and west and getting out of Shelby county, some going to nashville.
which frankly i don't blame them for choosing nashville.
I-40 should be 8 lanes with truck lanes separated from memphis to nashville at the very least, with separate exit ramps for trucks so they can get on the truck only lanes. it would at least prep I-40 for future demands, and better prepare the interstate for lots of truck traffic.
in fact, i once worked at a rest area and the supervisor himself told me in the 17 years he was working there, he saw traffic triple, especially truck traffic.