If you observe a traffic officer moving their arm alternatively up and down, what are they indicating?

Question

DentroTest · Accepted Answer

This specific signal obliges drivers approaching the officer from the side corresponding to the moving arm to slow down. It does not mean to stop completely (which is indicated by raising the arm vertically), but rather to moderate speed, likely due to a nearby hazard or to perform a controlled stop further ahead if subsequently indicated.

If you observe a traffic officer moving their arm alternatively up and down, what are they indicating?

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