ADAC tests high-visibility vests: some reflections are “completely inadequate”. Defective warning vests “are not only life-threatening, they also do not meet the legal requirements of the road traffic regulations and the vehicle is not correctly equipped,” it continues.
A good safety vest should now reflect bright white at a distance of around three meters. The testers recommend trying it yourself: simply hold a flashlight, the lamp on your smartphone or a headlamp directly next to your head.