Because the reflective vest is made of reflective (fluorescent) material.
Reflective vest is a warning and safety garment under various light conditions.
It is generally composed of a brightly coloured base (fluorescent) material and a reflective (reflective) material.
Reflective materials use glass or prism materials to make the incident light return along the original direction.
Reflective clothes made of glass beads, reflective vest markings, and fluorescent background, are hundreds of times more striking than reflective clothes without reflective materials.
The effect of fluorescence and reflection is stronger, which makes the wearer form a strong contrast with the surrounding environment in daytime and night, under the illumination of light.
Visual distance of 800 m is found by the driver, thus playing a role of safety protection.
Reflective materials are widely used in buildings. Traffic police, traffic coordinators, sanitation workers, logistics couriers, volunteer workers, highway and railway operators, and road construction workers'occupational safety uniforms play an excellent role in protection.
Over the past decade, the number of deaths from night traffic accidents in the United States has fallen by 40% due to the popularity and increasing use of reflective materials.
In various regulations or propaganda in European and American countries, the use of reflective materials is emphasized. For example, in the circumstances of rain, fog, snow and night vision discrimination, the elderly and children must wear or wear signs or clothing equipped with reflective materials when they go out.
