Which vehicles is a traffic officer ordering to stop when standing with their arms extended horizontally?
Signage: Traffic officers
Explanation
When a **traffic officer extends their arms horizontally**, they are indicating that vehicles must stop. However, this signal does not affect all vehicles equally. Only those approaching from the **direction that intersects the officer's arm** must stop. This means that the officer's arm acts as a **barrier** for vehicles coming from that specific direction.

It is important to note that this signal must be obeyed until the officer gives another indication, even if they lower their arms. Therefore, the signal is clear and specific for drivers approaching from the direction that the officer's arm is blocking.
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