There are three main types of exit signs: illuminated, non-illuminated, and self-luminous. Illuminated exit signs are powered by electricity and use light bulbs or LEDs to illuminate the sign. Non-illuminated exit signs are not powered by electricity and rely on reflective materials to reflect light from other sources. Self-luminous exit signs use tritium or other radioactive materials to create light without electricity.

Exit signs are required in all buildings that are open to the public. This includes businesses, schools, hospitals, and other public spaces. Exit signs must be placed in all hallways, stairwells, and other areas where people may need to evacuate the building.

Exit signs must meet certain requirements in order to be effective. These requirements include the size of the sign, the color of the sign, and the type of illumination used. Exit signs must also be placed in a conspicuous location so that they are easily visible to people who need to evacuate the building.

Exit signs should be inspected monthly to ensure that they are in good working order. This inspection should include checking the bulbs or LEDs, the battery, and the reflective materials. Exit signs should also be tested annually to ensure that they are functioning properly.