Does the vertical sign indicating audible warnings prohibited totally forbid the use of audible warnings?
Signage: Vertical signs
Explanation
The **prohibited acoustic signals sign** indicates that acoustic signals, such as the horn, should not be used indiscriminately. However, there are important exceptions to this rule.
- **Avoiding an accident**: Acoustic signals can be used if necessary to prevent an accident. This is crucial for road safety, as a warning sound can alert other drivers to an imminent danger.
- **Other permitted uses**: Although not mentioned in the question, it is useful to know that outside urban areas, acoustic signals can also be used to warn another driver of an overtaking or to indicate the need for passage in emergency situations.
Therefore, the correct answer is that **acoustic signals are not completely prohibited**, as they can be used to avoid accidents.
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