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Question:

What is this person doing?

A This is a flag person allowing traffic to proceed.
Explaination

Flag persons (also called flaggers) normally wear orange vests, shirts, or jackets and use red flags or stop/slow paddles to direct traffic safely through work zones. Flag persons are often provided in highway and street work zones to stop, slow, or guide traffic safely through those areas. In this figure, the flag person is allowing traffic to proceed.