‘L.A. at rush hour.’ ‘Disney World.’ American national parks feeling the strain this summer

A river of cars greeted Marti Pawlikowski, of Lancaster, Pennsylvania, when she arrived at Zion National Park on a Road Scholar tour this spring. “It took us 45 minutes to get through,” she said, adding that the delays didn’t stop once she entered the Utah park. “Waiting in line for the shuttle in...

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