Going over comment responses from A Brief History of the Exit Sign: https://youtu.be/i5uSlAw8U9s

Come see my panel at Vidcon! http://vidcon.com/agenda/8579/edutube-beyond-the-sciences/

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Sources and Further Reading:
Exit Sign Recognition for Color Normal and Colour Deficient Observers: http://www.lrc.rpi.edu/resources/pdf/30-1998.pdf
United States Usage of the I-Codes: https://www.iccsafe.org/about-icc/overview/international-code-adoptions/
Accessible Exit Sign Project: https://accessibleexitsigns.com/

Keywords
exit sign, ISO, emergency, fire, graphic design, interior design, architecture, graphics, fire safety, IBC, NBC, green running man, accessibility, accessible design, Canada, national building code