New York City's Domino Park and San Francisco's Mission Dolores Park now have marked circles to encourage proper social distancing.
The cities installed these circles in response to severe overcrowding. They're spaced six feet apart, following the Centers for Disease Control and Prevention guidelines.
To control overcrowding, New York City Mayor Bill de Blasio said police have also started limiting how many people can access the parks at a time and warned people they will be allowed to stay only for a limited amount of time.
Earlier this month, San Francisco Mayor London Breed threatened to close the park after seeing residents breaking stay-at-home orders.