1, red: basically used in some aspects, such as stopping, prohibition, danger warning or fire identification, equipment, body color, etc. Such as no line, no line sign; Fire fighting equipment, stop button and stop, operating handle of braking device, limit position scale on instrument dial, exposed parts of rotating parts of machine, strips and characters of liquefied petroleum gas tanker, danger signal signs, etc.

2. Yellow indicates caution and warning. Devices, equipment or environments that need warning are marked in yellow. Such as warning signs, traffic warning signs, road traffic signs, pulley inner wall and its protective cover, grinder cover inner wall, stair front steps, protective railings, warning signal flags, etc.

3. Blue: various instructions and regulations that must be observed, such as traffic signs and indicator signs.

4. Green means passable, safe and informative. Traffic or safety conditions can be marked in green. For example, it indicates traffic, machine start button, safety signal sign, etc. The national standard GB2894 (safety color) stipulates the meaning and use of safety color, lighting requirements, color range, inspection and maintenance, etc. The specific application examples and measures of implementing the safety color standard are given.

Therefore, the color of the car can not be changed "at will", including some "car stickers", body modification, color change and other behaviors. From this, we should know that as a car owner, we can't change the structure, decoration or body color of various cars at will.