ban banned entry human illegal man no prohibit prohibition road roadsign sign signs tresspass warning woman alert appropriate-behavior appropriate-behaviour black blue care communicating communication concern danger dangerous denied directions disapproval disapproved inform information informing not-allowed not-permitted permission-denied prohibited prohibitions protect protection red restricted restrictions risks risky rules safety symbols warning-sign white words 2014 artwork button medical purple vector virus website computers electronics New stop biohazard exclamation point fire flame lightning pictogram radioactivity skull symbol bar barrier crossing cutout fence isolated rail railroad railway Railway crossing roadsigns forbidden plate street traffic transport way go happy instruction light loud lucky meter neutral noise sad smile smiley smileys warn advice announcement be-careful beware careful caution direction footpath lookout observant pathway pedestrian pedestrians risk security walk walkers walking watch watch-out yellow approval approved bush-reserve conservation conserve control controlled dog dogs lead leash natural nature observation observe old park permitted pets public-park rust rusty