Police officers shall, whenever conditions require it, direct traffic in accordance with the provisions of this chapter. Police officers and members of the fire force are authorized in the event that a fire, or other emergency condition or the safeguarding or expediting of traffic so requires, to direct traffic otherwise than as this chapter specifically provides. The direction of traffic may be by word or audible signal, by gesture or visible signal, or by any combination thereof.
('67 Code, § 70.21)
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