Drone of San Francisco park with 6 foot circles painted for social distancing

covid19 social distance san francisco social distancing circle covid people shelter in place public social stop coronavirus safety distance new normal distancing distance epidemic flatten the curve personal space isolation keep your distance thank you for social distancing 2 meters pandemic coronavirus round contagious foot measure quarantine corona corona virus 2 m six please keep distance avoid health feet vector prevention protection instruction virus warning 6 feet safety 6 ft 6ft caution