Acoustic signals must be used...
Lighting
Explanation
**Acoustic signals** are sounds used to warn other drivers of the presence of a vehicle. These signals must be of a **non-strident sound**. This means that the sound should be clear and audible, but not annoying or excessively sharp.
The use of acoustic signals is allowed in specific situations, such as to **avoid a possible accident**, when overtaking on roads outside urban areas, or when performing a **priority service**, like taking a seriously injured person to the hospital. In these cases, it is important that the sound is effective but not disruptive, so a non-strident sound is the most appropriate.
Therefore, the correct option is to use acoustic signals of **non-strident sound** to ensure that their purpose is fulfilled without causing unnecessary disturbances.
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