State highways built a roundabout at an exit on the Interstate going to a rest stop/visitors center and truck stop. Unfortunately, the first turn off is the entrance to the truck stop. The roundabout road is only two lanes wide. More than once I've seen trucks have to take the second turn to the visitors center, and double back at the exit end of the rest stop parking and turn back to the truck stop so they could make the turn, and blocking both lanes while they come around the circle. It's at least 100' diameter too small, and should be two wide lanes, not two normal ones. Sometimes engineers aren't even as smart as AI suggestions.