This might be the most petty and ridiculously specific AHC I've ever seen. My first reaction, though, is to have most of the Lincoln Highway stay under one Route number after the federal reorganization of highways. That would make it a cohesive idea in people's minds instead of a conglomeration. But I thing sheer geography holds it back. Route 66 goes to LA from Texas. That's a pretty important shipping route for truckers. SF to Chicago through the Rockies without even hitting Denver just doesn't have enough in it to have high traffic in shipping.