It's a very good idea. There aren't really bike trails where I live now, but there are hundreds of miles of unimproved, gravel forest roads, which I ride during good weather. (They become impassable in winter.) I rode many of the trails in the D.C. area before I retired since I didn't feel safe riding the roads there due to the volume of traffic and aggressive drivers. They could use a volunteer program like there since it's not uncommon to run into people who've lost their bearings or don't have a basic toolkit on their bike.