Why is that sad? These can be logging trails you’d need to squint to actually see in the brush.

And 115 miles? That’s a huge distance.

Invasive species for one thing --- folks aren't nearly as careful about checking their vehicles as they ought to be.

Not huge enough when you're considering how the McDonald's have driven out little hole-in-the-wall places and that the presence of such a fast food restaurant requires a busy highway, or a reasonably dense population center.

Invasive species? Most of these trail aren't even used?

If they weren't used, they would quickly grow over and disappear.

Trail on a map don’t just “disappear” because they aren’t used.

Obviously you've never done trail maintenance --- an unused trail can quickly grow over, unless it is situated so that wildlife use it or there is some other mitigatingfactor.