Rocky Mountain National Park is adding an online reservation system that visitors must use if they want to access the park in an attempt to mitigate crowds during the coronavirus outbreak. The new “timed entry system,” as the park is calling it, goes into effect June 4. It’s only temporary, though, and will be removed later on as the park gradually reopens. “We are eager to welcome visitors back to their national park,” Superintendent Darla Sidles said in a press statement.