I parked at 660m as I was borrowing my brother's truck and didn't want to push it. The road is pretty degraded but I suppose you could drive if you were really motivated. The road gets narrow and very rocky, there are only a couple very small pullouts. After the Joan/Curran split sign the trail is single track. Quads and dirt bikes would have no problem. Shaun C previous report has good photos of the tougher sections, it still looked the same.