GB 14778-2025General rules of coloured light for safety (English PDF)

4.1 Red light

4.1.1 Representing Items Colors of light that indicate prohibition, cessation, danger, emergency, fire, etc.

4.1.2 Use Cases Colored light is used in various prohibition signs, traffic prohibition signs, fire equipment signs, mechanical stop buttons, brakes and parking devices. Place or facility.

Note. Examples include the colored light of "No Entry" signs for dangerous areas; the colored light of regular traffic lights indicating "Stop"; the colored light indicating prohibition or danger during road construction; and the colored light for general vehicles. The colored light of taillights; the colored light of nighttime markings on vehicles carrying explosives or other dangerous materials; the colored light of taillights on trains inside tunnels; and the colored light of warning lights suspended at dangerous locations inside tunnels. Colored light; colored light indicating the location of the emergency stop button; colored light used as a luminous signal to report emergencies and call for help; colored light indicating fire hydrants and fire extinguishers. Colored light used for the location of fire alarms, fire extinguishers, and other fire-fighting equipment.

4.2 Yellow light

4.2.1 Representing Items Colored light used to indicate alertness, warnings, etc.

4.2.2 Use Cases Used in places or facilities where colored light is used to remind people of important matters.

Note. Examples include the color light for "warning" signals on road traffic lights; the color light for "caution" signals in general; and the color light for signs indicating the direction of train travel at an entrance.

4.3 Green light

4.3.1 Representing Items Colored light indicating permission, safety, warning, rescue, etc.

4.3.2 Use Cases Used in places or facilities where colored light is required for permission, safety, warning, or emergency situations.

Note. Examples include safety passages in workshops and factories, pedestrian and vehicle traffic signs, first aid stations and ambulance stations, emergency evacuation routes, refuge areas in tunnels, and other safety measures. The colored light used for protective equipment indicator lights; the colored light used for equipment/machine start buttons.

4.4 Blue light

4.4.1 Representing Items Colored light indicating guidance, instructions, etc.

4.4.2 Use Cases Colored light is used in places or facilities where it is used for various instructions, signs, and other matters.

Note. For example, the colored light indicating the direction and location of a parking lot.

4.5 White light

4.5.1 Representing Items White light is the auxiliary color light.

4.5.2 Use Cases Used for text, arrows, and other information to indicate direction and location.

Note. For example, the text or arrows marked with this color light are used to achieve the purpose of "guidance".

5.Color range Safety colored lights should be clearly identifiable within the designed distance and should comply with the requirements of GB 2894.Appendix A provides the color values of safety colored lights. Color area range, color boundary, and color coordinates of the intersection of color areas.

6.Requirements for the use of safe colored light When using safe colored light, the brightness of the surrounding environment and its relationship with other colors should be considered, and the safe colored light should be clearly visible. Precautions should be taken when using it.