Just so y'all know, it is illegal to drive beyond Lupine to Cabin Flat or anywhere else beyond Lupine for that matter. We were backpacking there about a month ago and several 4WD vehicles passed us on the road, heading toward Lupine. When we got to Lupine, we ran into three rangers who told us all of the vehicles had been given tickets. They confirmed it is illegal to drive on that road beyond Lupine. Just so no one gets caught unawares!