I feel you made an error when you rebuilt I-540 around Fort Smith last year: you should have built a complete lane Northbound from AR 255/Zero St to AR 45/Old Greenwood Rd. It makes no sense to have an on-ramp that ends, then begins again a few hundred feet later as an off-ramp. You should have extended the on-ramp and turned into an Exit Only off-ramp.
The same thing applies to Southbound 540: the on-ramp from Old Greenwood Rd should have been extended as far as Zero St and made into an Exit Only ramp.
Yes, I know you built 540 in the mid-1960's to lower standards and never anticipated its current capacity, but if you're going to rebuild the road, why not make some improvements, too?