The introduction of high visibility clothing

High-visibility (HV) clothing, a type of personal protective equipment (PPE), is any clothing worn that has highly reflective properties or a color that is easily discernible from any background. Yellow waistcoats worn by emergency services are a common example. 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.

Application for rail workers in the United Kingdom
Experimental use of high-visibility clothing began in 1964 on the Scottish Region of British Railways. Fluorescent orange jackets, known as "fire-flies", were issued to track workers on the Pollokshields to Eglinton Street electrified section in Glasgow; In other areas, such as Edinburgh, Aberdeen and Inverness. Train drivers operating in these areas were asked their opinion as to the effectiveness of the jackets. Following trials, high-visibility clothing was issued to engineering and other staff working on the electrified lines of BR's London Midland Region in 1965. It was thought to be more important due to the higher speeds of the newly electrified WCML route from Euston to Manchester, Liverpool and Birmingham. The first version was worn as a jerkin and was "visible at ...半 a mile in normal weather conditions.
Since then, features of high-visibility clothing such as the EN510 quick release standard and the EN471 high visibility standard, have improved the effectiveness and contributed to improved safety for rail workers. The specifications for high visibility clothing suitable for use on railways in the United Kingdom are published by the Rail Safety and Standards Board

Standards
Various ISO member bodies have published similar standards for high-visibility clothing to be worn as personal protective equipment.
ANSI / ISEA
The American National Standards Institute published standard 107 for high-visibility clothing in 1999. The standard defines three classes of successively more-visible garments, to protect workers exposed to successively higher levels of risk from motor vehicles and heavy equipment. The International Safety Equipment Association Developed the standard, with revisions in 2004 and 2010.
The standard specifies three classes of activities and the minimum quantity of fluorescent and retroreflective material to be worn in each class. In Class 1 activities there is a relatively low hazard from slow-moving vehicles, for example, in a parking lot. Garments must have Retroreflective strips 1 inch wide and a minimum of 217 square inches of fluorescent material. Class 2 activities take place in proximity to vehicles moving up to 25 miles per hour, for example, railway workers or school crossing guards. The standard requires reflective bands of greater Width and 755 square inches of conspicuously colored fabric. Class 3 activities take place near traffic moving faster than 25 miles per hour, for example, highway construction. The standard requires at least 1240 square inches of fluorescent fabric, and two-inch retrorefector bands. Only very large vests have enough enough area to meet this standard, so full sleeves may be required. A further class of garment is Class E high visibility pants, which, in conjunction with a Class 2 or Class 3 vest, are recommended by the standard for Class 3 activities.
In 2006, ANSI released American National Standard for High-Visibility Public Safety Vests standard 207, in response to issues raised by public safety officials with respect to the ANSI 107 vest design. Their concerns were both tactical and influenced by a need to differentiate between law Enforcement / emergency personnel and the vests worn by construction workers. For example, red material identifies fire fighters, and blue is used for police.
The 207 standard has different requirements for fluorescent background material, specifically allows for a shorter design that allows equipment belt access. It also includes many optional features, such as a 5-point breakaway design for easy removal, panels quickly identifying the wearer as an emergency Responder, and radio and badge pockets / holders.
EN 471: 2003
EN 471 was a European Standard for high-visibility clothing. It was discontinued in 2013 as its successor ISO EN 20471 became valid. It specified three classes of garments:
• Class 1
Class 1 defines the lowest visibility level e.g. High-visibility trousers with two 5 cm reflective bands around each leg. These become Class 3 when worn with a Class 3 jacket.
• Class 2
The class 2 defines an intermediary visibility level. Example: vests. Two 5 cm bands of reflective around body or on one 5 cm band around body and braces to both shoulders. (This class is required for motor v