https://www.nps.gov/muwo/planyourvisit/reservations.htm
На этой же странице информация по другим паркам:
Are other national parks using reservation systems?
Similar programs are in use at Haleakalā National Park, Hawaii, where a reservation must be made to park between 3 am and 7 am for sunrise viewing, and at Yosemite National Park, California, where visitors have the option to reserve a parking spot on four peak weekends. Zion National Park is also considering a similar parking/arrival reservation system.