Guys I live in the city with no reliable means of transportation to go someplace cool. I'm also in college so even if I were to bike somewhere far and try to stay out there for a bit I would have to come back of course.

So for now I'm just planning on going to the pic-related area, Mt. Airy Forest. It's only like 1500 acres but I want to just get out there as much as possible because I'm tired of sitting around at home.

So I went ahead to their website for a map and this was the only one they had. Apparently all the trails in red are closed? Does that mean they just don't want people on them or that they are unsafe or something?
I'll probably end up exploring them anyways after getting a feel for the area but I was wondering if anyone knew a reason for closing off essentially all the trails in the area?