Reflective glass beads are among the most economical means to create safer driving conditions. Only road markings that contain glass beads are night-visible. No beads - no visibility at night. When a car's headline beam shines on a striping which integrates glass beads, the striping seems to light up and gets much better visible at night. This effect is called retroreflection.
Glass beads and road marking materials together form a retroreflective system. Glass beads are the result of a recycling process. Flat glass cullet (waste glass from window manufacturers) is crushed and transformed in furnaces into spherically shaped reflectors that become a road safety product.