Most roads in North America and other parts of the world are not lit by road lighting systems that are fixed on masts, so car lighting is a key component for safe driving at night.
The performance requirements for automotive headlamps are based on standards and recommendations issued by the Association of Automotive Engineers (SAE) and similar industry organizations.
These requirements specify the minimum or maximum luminous intensity of illumination from the center of the vehicle lighting system in different directions.
Countries outside North America also have similar photometric performance requirements.
These regulations may differ in details, but they all specify the luminous intensity in order to ensure that the vehicle lighting system provides sufficient light for drivers to see the road, reduce glare to other drivers as much as possible, and ensure that vehicle signal lights can be detected in a timely and clear manner.
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