Knowing how ARDOT works, about the time they finish 6-laning, it will need 8-laning.
You must drive I-49 between Fayetteville and Rogers often, lol. I said that when they widened it, go for 8 lanes or build the bridges and overpasses to accommodate it later.
I was shocked that OTA did actually provide for an expansion to 8 lanes when they widened I-44 between Kellyville and Sapulpa. All bridges are already wide enough and all overpasses have piers set back far enough so the future expansion will be a breeze. I say that because maybe there's hope for ArDOT to wake up to this.
The White River bridge on I-40 is built for 6 lanes even though it's striped currently for 4. Same thing for 1 of the 2 St. Francis River bridges. They are waking up, slowly but surely. These are the greatest hurdles for 6 laning between LR and Memphis, so it's starting to sink in, apparently.