be cartel dump dumping no no dumping prosecute prosecuted sign signage violators warn warning will background blind braille bumps city crosswalk feel San Francisco sidewalk street surface tactile texture urban yellow angry evil eyes face female girl glare moody portrait portraiture scared scary stare teen teenage teenager woman alarm danger dangerous death electric electrical electricity green hazard notice paint peeling wall wood barricade construction flash flasher lens light safe safety sicherheit sicurezza sikkerhed veiligheid achtung communicate communication cuidado lake no trespassing peligro signs trespass trespassing waterfront authorities authority black blue car control flashing lights lights motor vehicles police red traffic traffic control vehicles warning lights white electrocute electrocution fence keep out metal railings substation transformer