What kinds of safety signs are there?

The state has formulated 56 kinds of safety signs, which are divided into the following four categories.

(1) No-pass sign: It means that people are not allowed or prevented from doing something. No smoking, no traffic, etc. 16.

(2) Warning signs: It means to remind people of possible dangers. Watch out for fire and pay attention to safety.

(3) Description marks indicate the regulations that must be observed. Seat belts must be worn: 8 kinds of gas masks must be worn.

(4) Prompt sign: Its meaning is to indicate the direction of the target. There are 9 kinds of fire exits, safe exits and places for storing fire-fighting equipment.