(a) Persons may enter and use the parks from 6 a.m. until 1 a.m. at all times unless other open hours are posted by a park sign at any park or any portion thereof. No person shall enter, loiter or remain in any park without the permission of ParksCorp or the BPCA except during open hours.

(b) Whenever a threat to public health or safety exists in any park resulting from any natural cause, explosion, accident or any other cause, or by riot or other significant civil disturbance or unlawful assembly or activity, ParksCorp or the BPCA may close the parks or any portion thereof to all unauthorized persons for such duration as it deems necessary to ensure the safety and well-being of the public.