High-visibility (HV) clothing, a type of personal protective equipment (PPE), is any clothing worn that has highly reflective properties or a colour 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; they were later tried 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 ... half 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.
The Hurt Report found that very few motorcyclists involved in collisions wore high-visibility clothing, and that just over half of the collisions studied, nearly two-thirds of those involving another vehicle, were due to the motorist unintentionally violating the motorcyclist's right of way. "This dominant culpability of the driver of the other vehicle... emphasizes the special need for high contrast conspicuity for the motorcycle and rider." 
A New Zealand case-control study found that the population attributable risks were 33% for wearing no reflective or fluorescent clothing; one third of motorbike accidents might have been prevented by wearing high-visibility clothing.
Traffic risks to the cyclist are similar to those faced by motorcyclists (see SMIDSY), with the main differences being that bicycling speeds are typically lower, and the bicyclist wears less protective gear. In a 2009 study, most UK cyclists and almost all motorists believed that high-visibility clothing would increase cyclists' visibility. Almost all drivers agreed that cyclists need to wear reflective clothing in low lighting environments, whereas less than three-quarters of cyclists (72%) agreed, and less than half claimed that they always did so.
A Cochrane Systematic Review of research evidence for the effectiveness of visibility aids (fluorescent and retroreflective clothing and equipment) was carried out by Kwan and Mapstone in 2006. The authors found 42 studies which collectively suggested that fluorescent clothing could increase the distance at which drivers could detect and then recognise cyclists in daylight conditions. The same review found evidence that retro-reflective materials worn by cyclists at night had a similar effect on driver perceptions. At that time there were no studies published that had actually demonstrated a reduction in collision crashes for bicyclists wearing fluorescent or retroreflective clothing whilst on public roads.
A 2009 Australian study of drivers trying to see stationary cyclists on a closed circuit found that fluorescent vests (without retro-reflective stripes) were not a significant improvement on black clothing at night, and that retro-reflective strips were more effective when attached to knees and ankles than on a more or less static jacket. When cyclists wear fluorescent clothing, a driver’s perception distance (when the driver first spots something on the road) increases from 400 feet to 2,200 feet during the day.
A 2012 British case-control study showed a non-significant increase in the odds of a crash for users of reflective conspicuity aids whilst cycling. In 2014, a further case-control study conducted in Canada reported a decrease in the odds of a collision with a motor vehicle when wearing 'light' coloured (not specifically fluorescent) clothing in daylight but an increase in the odds of a collision for cyclists using fluorescent clothing (and lights) at night. The number of conspicuity aids used was positively associated with an increase in collision crash odds but a non-significant reduction in the likelihood of hospitalisation.
A randomized controlled trial was conducted in Denmark between 2012 and 2013. The study collected data from 6793 regular cyclists for a year. The results suggest that conspicuity enhancing jackets can reduce by 47% the risk of collisions with other road users that cause injury and 55% for those collisions involving a motor vehicle. The effect of the intervention was higher in winter compared to summer (56% vs 39%), in daylight (51% vs the overall effect 47%) and for those participants who reported 'high' use of the jackets vs 'low' use (60% vs 33%). The study was based on participants self-reporting data, and there was evidence of response bias, which the authors attempt to correct for, reducing the 47% figure to 38%.
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 207 standard has different requirements for fluorescent background material, specifically allowing 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 readily identifying the wearer as an emergency responder, and radio and badge holders.
North American hunting regulations
Hunting laws in each state or province may require hunters to wear designated garments in blaze orange to prevent misidentification of humans as game animals, and resulting shooting accidents. The required total visible area and times of use vary by jurisdiction and by the type of hunting in the area. Hunting clothes are available in blaze orange camouflage, where the bright orange color is plainly visible to human eyes, but the shape of the hunter is broken up by irregular patterns to prevent identification as a threat by game animals such as deer, who cannot see the color.
- Chartreuse yellow (also called neon yellow)
- Display (zoology) – High-visibility in nature
- Retroreflective sheeting
- Safety orange
- Cooke, B.W.C., ed. (July 1964). "Notes and News: "Fire-fly" jackets for men on the line". Railway Magazine. Westminster: Tothill Press. 110 (759): 593.
- Cooke, B.W.C., ed. (November 1965). "Notes and News: High visibility clothing". Railway Magazine. London: Tothill Press. 111 (775): 668.
- "Rail Industry Standard for High Visibility Clothing" (PDF). Rail Safety and Standards Board. 2016. Retrieved 2017-04-02.
- Susan Wells; et al. (April 10, 2004). "Motorcycle rider conspicuity and crash related injury: case-control study". BMJ. Retrieved 2007-06-26.
- Wood, J.M.; et al. (2009). "Drivers' and cyclists' experiences of sharing the road: Incidents, attitudes and perceptions of visibility". Accident Analysis & Prevention. 41: 772–776. doi:10.1016/j.aap.2009.03.014.
- Kwan I, Mapstone J. Interventions for increasing pedestrian and cyclist visibility for the prevention of death and injuries. Cochrane Database of Systematic Reviews 2006, Issue 4. Art. No.: CD003438. DOI: 10.1002/14651858.CD003438.pub2.
- Wood, Joanne M., Tyrrell, Richard A., Marszalek, Ralph P., Lacherez, Philippe F., Carberry, Trent P., & Chu, Byoung Sun (2011) Using reﬂective clothing to enhance the conspicuity of bicyclists at night. Accident Analysis and Prevention, 45(March), pp. 726-730. http://eprints.qut.edu.au/47281/1/
- Miller, Phil (2012). The use of conspicuity aids by cyclists and the risk of crashes involving other road users: a population based case-control study (PhD). U. of Nottingham.
- Hagel, B.E.; Romanow, N.T.R.; Morgunov, N.; Embree, T.; Couperthwaite, A.B.; Voaklander, D.; Rowe, B.H. "The relationship between visibility aid use and motor vehicle related injuries among bicyclists presenting to emergency departments". Accident Analysis & Prevention. 65: 85–96. doi:10.1016/j.aap.2013.12.014.
- Lahrmann, H.; Madsen, T.K.O.; Olesen, A.V.; Madsen, J.C.O.; Hels, T. (2017). "The Effect of a Yellow Bicycle Jacket on Cyclist Accidents". Safety Science. doi:10.1016/j.ssci.2017.08.001.
- Siff, Andrew (2013-02-22). "NYC to Crack Down on Food Delivery Cyclists". NBCNewYork.com. NBCUniversal. Retrieved 2017-10-24.
- "ANSI/ISEA 107-1999 American National Standard for High-Visibility Safety Apparel". eLCOSH. Retrieved 2007-08-26.
- "ANSI/ISEA 107-2004 MADE EASY: A Quick Reference to High-Visibility Safety Apparel". 3M. Retrieved 2007-08-26.
- "ANSI/ISEA 207-2006: American National Standard for High-Visibility Public Safety Vests". Iron Horse Safety. Archived from the original on 2008-09-08. Retrieved 2009-02-19.
- "Council Directive 89/686/EEC of 21 December 1989 on the approximation of the laws of the Member States relating to personal protective equipment". December 21, 1989. Retrieved 2008-03-24.
- Gary Clancy Larry R. Nelson Hunting Whitetail Deer: Innovative Techniques for Any Situation Quayside, 2000 ISBN 1610602773 p.83
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