the Lincoln Highway, maintained by the Lincoln Highway Association, were well-known and well-organized, while others were the work of fly-by-night promoters, to the point that anyone with enough paint and the will to do so could set up a trail. Trails were not usually linked to road improvements, although counties and states often prioritized road improvements because they were on trails.

In the mid-to-late 1920s, the auto trails were essentially replaced with