Larry Warren said in the April 10 High Country News that, "Beginning May 23, Zion (National Park) becomes the first Western park, and just the second in the national park system, to go carless. Acadia National Park in Maine was the first."
Mr. Warren should check out the history of Alaska's Mt. McKinley National Park, which in 1980 was re-named Denali National Park and Preserve. For the past 25 years or so, the only motorized access into the heart of the park is by free shuttle buses which travel the 90-mile dirt road between park headquarters and Wonder Lake. I would venture to guess that this use of shuttle buses was the Park Service's first and longest-running use of mass transportation to solve visitor circulation problems.