Correct answer
Long.
When a traffic officer orders traffic to move off again using a whistle, they will give one long blast. This is a clear signal to drivers that they can continue on their way safely. On the other hand, if the officer gives a series of short, frequent blasts on the whistle, this indicates the order to stop completely. These short and long whistle signals are an effective way of communicating with drivers and ensuring a safe and orderly flow of traffic.
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Short and frequent.
Long.
The whistle is not used for this type of order.
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