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The Occupational Safety and Health Administration is a division of the United States Department of Labor. This organization is responsible for setting safety guidelines for workers at risk of injury. When construction workers or police officers are working on road projects and must direct traffic, they are required to follow OSHA visibility guidelines. The OSHA standards on work zones are defined here:

https://www.osha.gov/dte/grant_materials/fy08/sh-17795-08/workzone_hazards_awareness_english.pdf

Read more at :http://www.ehow.com/list_6801301_osha-visibility-requirements.html