High-visibility vests in the ADAC test: reflection partly “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. If you want to be on the safe side when purchasing, you should pay attention to the EN ISO 20471 identifier which should be on a sewn-in label.