Wayne,
I will let others comment on any trespassing issues with respect to the dirt road route. That is a private road with a gate across it, so I assume that it is private property. On the other hand, the steep goat path down from the highway (the route I take) is just woods. It may be private property, but I have never seen anyone there other than fans with cameras. I would not worry about trespassing there. I would worry more about slipping on wet vegetation, or tripping over sharp barbed wire, which is lying on the ground in the flats just below the pull-off. Seriously, just be careful there. If you trip and get hurt, it's not like anyone is going to happen by to help you.
/Kevin Madore