Federal Highway Administration requires workers to wear ANSI 107-2004 Class 2 or Class 3 high visibility safety clothing when working on government funded projects.
CCOHS: High-Visibility Safety Apparel
The curious, and dangerous, British obsession with high-vis
High Visibility Standards for Australian Workwear
4 Things to Look for When Choosing High Visibility Clothing
Hi-Visibility & Enhanced Visibility Uniforms
Men's High Visibility, Safety & Reflective Clothing, Carhartt
Men's High-Visibility
Australian High Visibility Gear Standards – Absafe
Hi-Vis / Reflective Safety Clothing
High Visibility
What is High Visibility Clothing?
High Visibility Vest And Safety Footwear Signs - from Key Signs UK
What Hi-Vis colour do you need?