The National Park Service (NPS) currently do not permit a Park to allow additional overnight visitors if the campground is full.
Self-propelled visitors (SPV), a person arriving by foot, bicycle, canoe, or other mode of movement NOT utilizing a motorized vehicle, frequently arrive after the park campground has sold out. The vast majority of the SPV use a small tent. If a campground is sold out, a SPV may not be able to travel to the next available campground before dark.
Whereas a SPV visitor using a tent takes up very little space and has little environmental impact, we herpetitiontion the Federal Government to require the NPS to always allow SPV a place to legally camp for one night even if the campground is considered full.