be cartel dump dumping no no dumping prosecute prosecuted sign signage violators warn warning will construction fence plywood post no bills San Francisco stencil typography urban wall wood advice alert announcement appropriate-behavior appropriate-behaviour be-careful beware black care careful caution colors colours communicate communication concern danger dangerous dangers drowning-danger information informing lettering lookout message observant red restricted restriction restrictions risk risks risky river riverside safety signs symbols text warning-sign watch watch-out water wet yellow accounts bank banking bill due fiscal money personal poor rich save saver savings taxman triangle visual wealth windfall cold flood lightning nature rain storm road security snow square street thunderbolt travel wild cloud downpour drop droplet avoid communicating crocodiles crocs directions no-swimming not-allowed not-permitted permission-denied prohibited prohibition protect protection rules swimming unsafe white consumption denied health Look looking no-diving shallow undrinkable unhealthy access-denied damage demolition destruction hazard hazardous keep-out no-access no-entry requirements unwanted