An officer, with short and frequent whistle blows, orders...
Signage: Traffic officers
Explanation
Traffic **officers** use different signals to communicate with drivers, and these must always be obeyed. One of the ways officers give instructions is through **audible signals with a whistle**.
- When an officer makes **several short and repeated whistle blows**, it means that vehicles must **stop**. This signal is clear and specific to indicate that drivers must immediately halt their movement.
Therefore, when an officer uses this audible signal, the vehicles being addressed must stop, thus complying with the officer's order.
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