I have been in a National Forest area where off trail hiking is allowed, and came across a trail closed sign. It didn't say why, and the only obvious problem was that in the past few months a storm had dropped a bunch of trees across the trail. At the time I wondered if it would be ok for me to continue on the trail, or should I parallel it off "trail", or should I avoid the area completely. So I think it would be better if a trail closed sign indicated any fine, and preferably why it was closed.