Correct answer
On urgent duty with the required signals and obeying officer instructions.
When on urgent duty and giving the required signals. Normally it uses light and sound signals; light alone is allowed if omitting the sound creates no danger for others. Officer instructions must always be obeyed. Before exercising priority at a junction, its driver must take particular precautions and check that there is no risk and others are giving way.
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Always, including ordinary travel without an emergency.
Never, even on properly signalled urgent duty.
On urgent duty with the required signals and obeying officer instructions.
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