Motorists and automobiles at entrance to Yellowstone National Park

View of motorists and cars parked in front of Roosevelt Arch at entrance to Yellowstone National Park. Inscribed on gate: "For the benefit and enjoyment of the people, Yellowstone National Park." Handwritten on back: "Automobile travel. Yellowstone Park, old cars at entrance." Typed on back: "Motorists waited in line for the 1923 season opening day at Yellowstone National Park. During the twenties, an official opening ceremony was held annually at Roosevelt Arch at the north entrance. This picture was taken on June 20, 1923. Since August 1, 1915, when automobiles were first allowed to travel through Yellowstone over a carefully prepared one-way route, millions of visitors have driven to the famous national park to see the wonders of nature. Photo from the National Park Service."