advice aid alert announcement assist assistance availability available aware awareness blue caution communicating communication concern directions equipment extinguish extinguisher fire fire-control fire-extinguisher firefighting foam help information informing limitations limited location observant observe red risk risks safety sign signs white advising black communicate danger electric-power electrical electricity electricity-power-lines energy height high high-voltage overhead power power-lines power-supply protect protection risky strength supply warning wires wiring yellow alcohol appropriate-behavior appropriate-behaviour banned be-careful beware consumption listen Look looking lookout no-alcohol not-allowed not-permitted prohibited prohibition warning-sign care dangers deep deep-water denied depth direction don’t-alight flowers foliage permission-denied plants river riverside water wet avoid careful dangerous flammable gas gaseous natural-gas no-ignition outlet potential stay-clear vapour vapours warned appropriate behavior appropriate behaviour chinese colors colours emergencies emergency english languages rain rain-drops slip slippery slippery floor slippery surface slipping warning sign wet surface children kids slow slow-down slower watch watch-out not allowed not permitted permission denied polluted pollution rules toxic toxicity water pollution water toxicity weathered worn traffic vehicles cars monitored monitoring noted observed site-regulations speed cautious inform message please polite prohibitions rectangle rectangular signage text words