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IS 218:2014 is the Indian Standard (BIS) for glass beads for road marking. IS 218 covers glass beads that are mixed into or dropped onto road marking paint to make it retroreflective (visible at night in headlights). The beads act as tiny retroreflectors, bouncing headlight beams back toward the driver. Critical for road safety.
Specification for glass beads used in retroreflective road marking paints covering size distribution, roundness, refractive index, and testing.
Glass beads make road markings visible at night by retroreflecting vehicle headlights back toward the driver. Without beads, road markings are barely visible in the dark, especially in rain.