On the AT, there are white paint marks intermittently on trees, and at tight turns, or other areas of misinterpretation, there are two white marks on trees to alert one to an upcoming place to think before going ahead. On other routes, there are white or blue marks on rocks to do the same. Examples in VA include Old Rag, and Dragons Tooth.

To do this all along the Whitney Trail.... helpful?....eyesore?.... subject to defilement?.... maintenance?...liability? ....subject to interpretation? ....etc