Cutoff distribution, in the context of the lighting industry, refers to a classification system that regulates the light distribution from a luminaire. It is designed to control the amount of glare produced by a luminaire, particularly at specific vertical angles, in order to enhance the comfort and safety of drivers. The cutoff distribution classification system categorizes luminaires based on the intensity of light emitted at certain vertical angles. There are different categories within this classification, each with specific criteria for intensity limitation.