Final answer:
The three whistle commands for directing and controlling traffic are: one short blast to stop, two short blasts to start moving, and three short blasts to slow down or yield the right-of-way.
Step-by-step explanation:
The three whistle commands regarding directing and controlling traffic are:
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For example, if a traffic officer blows one short blast on the whistle, it indicates that drivers should come to a stop. If the officer then blows two short blasts, it means that drivers can resume moving.