Self-illuminating solar road stud greatly improve the driver’s effective warning distance, and unlike traditional reflective signage, NOKIN solar road stud can see a distance of a mile, thus helping to prevent accidents, emitting not reflected light, but especially for sections that cannot pick up large beams of light. Effective yellow light-emitting diodes are attractive, but do not distract the driver (also available in blue, red, green and white). Solar road studs are easy to install with virtually no maintenance required.