Safety Standards and References

High Visibility Clothing
The standard for high visibility requires that clothing must provide visibility of the user in a hazardous situation under any light conditions by day, and under illumination by vehicle headlights in the dark (24hr visibility). It's mainly used in Mining, Drilling, Oil & Gas , Traffic, Policing, Manufacturing Palnts, Automobile etc.

BS EN 471: 2003
High visibility clothing

Classifiacation of Garment includes :

CLASS D: A garment  designed for daytime use
CLASS N: 
 A garment  designed for night use using retroreflective light
CLASS D/N:  A garment  designed for day and night use