It shall be unlawful for any person to loiter or stand or sit in or upon any public highway, alley, sidewalk, or crosswalk in the unincorporated territory of the County so as in any manner to hinder or obstruct the free passage therein or thereon of persons or vehicles passing along the same or so as in any manner to annoy or molest persons passing along the same. (§ 1, Ord. 140)