National Park Trail Markers

The trail marker system in the national parks uses a combination of carved wooden signs, painted blazes on trees. Cairns, small stacks of rocks, and the redundancy of multiple marker types ensures that hikers can navigate even when 1 system fails. A blaze obscured by snow, a cairn knocked over by wind, a sign post rotted at the base. Wooden signs at trailheads typically use routed lettering filled with brown or white paint on a brown background. Format has been consistent across the National Park Service since the 1960s, using a specific serif typeface that NPS calls Rawlinson and a standard layout that puts the trail name above and the distance below. Blazes painted on trees are the oldest wayfinding system in hiking, usually a 2 by 6 inch rectangle of paint at eye level. Color indicates the trail, white for the Appalachian Trail, blue for side trails, and each park system has its own conventions. The cairns are the most interesting from a design perspective because they are user-built and maintained. With experienced hikers adding stones when they pass and the collective contribution keeping the markers visible across barren terrain where trees and signs are impossible. I hiked in Acadia last summer and the cairn fields on the exposed granite ridges were navigational necessities because without them you would have no reference points on the open rock. Entire system works because it layers analog technologies that degrade gracefully, losing 1 marker type still leaves you 2 others. The robustness of that approach is a design lesson that digital wayfinding systems could learn from.