James, I emailed my contact in Inyo N.F. and was told that SAR members had already added some rocks along the trail there. After John Likely's accident, I started a rock berm (small ridge) there, maybe a foot high. This past summer, I noted it had been diminished a little -- probably by people stumbling over it in the dark.
In your letter, you asked for better visual cues -- cairns, small signs. I disagree. In every situation where someone missed the turn, it was in the dark. Small rock walls won't help in the dark.
There needs to be a major wall of boulders moved into that spot!!!