Signing petitions is fine, but it's a short term band-aid for access issues.
Instead I would encourage all to join their local off-road motorcycle organization that is working hard to preserve single-track access. One such group here in Calgary is the Rocky Mountain Dirt Riders. Sign up at their booth at the Calgary bike show so they can put your membership dues to work. All other user groups have strong organizations that get their voice heard - motorcyclists, especially single-track riders, need to get on that game plan.