A park employee closes a gate in California’s Yosemite National Park.

371021 09: A park employee closes a gate on the road to Mariposa Grove of giant sequoia trees behind a bus carrying people who could not drive to the big trees because the parking lot is full, June 18, 2000 in Yosemite National Park, California. The National Park Service hopes to increase mass transit and reduce the number of cars within Yosemite Valley. (Photo by David McNew /Newsmakers)