I decided to walk down the road rather than the trail on the way back. I figured since the road was supposed to be closed to traffic, it wouldn't be too much of a problem or too dangerous. I was right.
Below you'll find some pictures from the walk down. You can see why they don't want people walking along the road as well as why they don't want any long vehicles on it.
Apparently they filmed a scene from Forrest Gump on this location.