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The traffic police officer’s arm raised vertically signifies stop for all traffic participants who are approaching, regardless of the direction in which they are traveling. This signal is a preliminary signal, after making it wait for the next signal of the traffic police officer, such as raising the arms in the horizontal plane.

The correct answer is: C

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All signals of the traffic police officers explained - Audio-Video Lesson --> Road Traffic Code - Signals of the traffic police officer

Regulation** - Article 88

(1) The signals of the traffic police officer who directs the traffic have the following meanings:
a) the arm raised vertically signifies "attention, stop" for all traffic participants who are approaching, except for the drivers of vehicles who could no longer stop in safety conditions. If the signal is given in an intersection, this does not impose the stopping of the drivers of vehicles who are already engaged in crossing;
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** Regulation = REGULATION for the implementation of OUG 195/2002 updated (Road traffic code regulation)