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High-visibility clothing, sometimes known as "hi-viz", is any clothing worn that is highly luminescent in its natural matt property, or a colour that is easily discernible from any background. Most commonly worn on the torso and arm area of the body. Most industrial employers require it as a type of personal protective equipment (PPE). Traditionally, yellow waistcoats worn by emergency services are a common example, but in more recent times any type of clothing in the "Hi Viz" colour spectrum is now deemed acceptable.

Accepted colours are usually light green/ yellow, orange, and pink from a magenta derivative. Contrasting colours such as dark blue, black and white are often incorperated in the design of "Hi Viz" clothing. Occupational wearers of clothing with high-visibility features include railway and highway workers, airport workers, or other places where workers are near moving vehicles or in dark areas. Some cyclists wear high-visibility clothing when riding amongst motor vehicles. Hunters may be required to wear designated high-visibility clothing to prevent accidental shooting.

Reflective tape originally developed by 3M may also be used to enhance "Hi Viz" clothing in low light conditions. However some reflective tapes can reflect as much as 82% of the source light causing retinal damage. It is therefore recommended that aircraft pilots, professional truck/ bus drivers and operators of heavy plant (encased in mainly glass ROPS) refrain from wearing highly reflective clothing while conducting their duties.

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