I almost always carry a $20 permit for woodcutting in the local national forest (valid from early April to early December). This allows me to cut and remove most downed trees (up to 4 cords worth, counted by 1/4 cords) as long as I don't leave designated, open forest service roads. Most National Forests require a permit to cut downed trees, even if they're blocking the road, with the exception that you can do so without a permit if you are literally trapped by the tree. If your choice is to cut the tree or go offroad, they prefer that you cut the tree. If your choice is to take a slightly longer--but still--safe route, they prefer you take the longer route.