I think it is a matter of getting not only all the way off the pavement but also off the shoulder. I seem to have read/heard that somewhere.

For years I have told myself, "Self, do not slam on those brakes to get that shot. The ditch is just not worth the encounter." Yes, I still have to tell myself this. I almost dropped the nose of the truck off into a culvert outside Farmington, NM. It is hard to remember that by the time I got off the road I had already passed the viewpoint that caught my attention. If weather or rapidly waning or waxing light were involved it was already too late. It is hard to talk one's self out of such foolishness.

The cone is a grand idea.