To identify the obvious danger is that any channel which channels the garbage is not dangerous as hazardous waste by the box painted red squares are painted green, not dangerous waste.
To identify any obvious danger that channel. What channel is not hazardous waste as hazardous waste by the red paint. The green paint is not hazardous waste.
To indicate clearly that any channel danger. Any channel is garbage harmless by channels that hazardous waste is painted red. The channel is garbage harmless painted green.