What signal is being indicated by an officer who moves their arm up and down intermittently?
Signage: Traffic officers
Explanation
**Agent's signal: arm moving up and down**
When an agent intermittently moves their arm up and down, they are ordering the **obligation to reduce speed** to those approaching from the **side of the arm making the signal**. This order **takes precedence over any other signal**. Exceptions are made only for those **unable to stop with sufficient safety**.
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