The markers which are often made of plastic ceramic or various types of colored marking tape help make it easier for drivers to see divided lanes on highways. Small rectangular reflectors with 3 inch diameters are designed to be visible at night or in harsh weather. Road studs reflect incident light by using a retro reflector, thus reversing the direction of visible light from vehicle headlights and returning it along a parallel path. Hence, when driving along a road at night, the road studs are visible without the need for power to light the stud.
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