When a traffic officer gives a long, continuous whistle blast, they are ordering...
Signage: Traffic officers
Explanation
Traffic **officers** use different signals to communicate with drivers and give them clear instructions. One way officers communicate is through **audible signals with a whistle**.
- When a traffic officer emits **a long whistle blast**, it indicates that vehicles should **resume driving** and continue on their way. This signal is clear and specific so that drivers know they can proceed.
- In contrast, if the officer uses **several short and repeated whistle blasts**, this means that vehicles must **stop**.
Therefore, when you hear a long whistle blast, you should understand that it is a signal to start moving again.
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