Cyclists looking for a quiet, car-free, early-season ride should cross Yellowstone National Parkâs South Gate off their list. As with Grand Teton National Parkâs inner Teton Park Road, Yellowstone keeps some of its interior roads closed to motor vehicles for several weeks in spring while opening them to human-powered recreation. But last week the park announced a permanent ban on bikes between the South Entrance and Grant Village during the spring shoulder season. Foot traffic there is still allowed. âUsually there are high snowbanks, no place to get out of the road and no restrooms in that section,â Yellowstone spokeswoman Linda Veress said. âIt wasnât the safest place to ride a bike.â