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What are osha's requirment for safety vests on a jobsite in arizona? - construction safety vests

Need to know whether, if my children need Workin dirt Passess In between each person and the building, they wear a vest or they do not know where I can find this information had, tried to OSHA safety and health for construction, but found nothing, but work close to public transportation, but transit is not so How can I fix this