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

By Jen Rose Smith (CNN) — 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