Enhance the reflection of road marking lines during the raining night since the tiny glass beads in the thermoplastic are non-reflective in the rainy water.
Solid glass road studs work by retro reflection. The incoming light is bounced back by a retro reflector in the exact same direction from which it came, for 360 degrees. This is important in traffic, as the reflector reflects the light of vehicles from every angle back to the road users, which guides or alarms them in various traffic situations.