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The standard classifies roadways by their function and traffic volume. High-speed, limited-access highways require strict luminance control to prevent driver fatigue and ensure long-range visibility. Local streets focus more on illuminance to illuminate sidewalks and intersections. Intersection and Crosswalk Lighting

With the rapid adoption of Solid-State Lighting (SSL) and LEDs, controlling light pollution has become critical. RP-8-18 integrates the rating system to help designers limit sky glow, light trespass into adjacent properties, and blinding glare for drivers. Key Technical Metrics and Design Criteria ansi ies rp-8-18 pdf

Design methods for highways and streets (luminance and illuminance methods). The standard classifies roadways by their function and