An audible signal can be used in this situation

Explanation

The horn may be used only to prevent a collision.

The rule is: the horn is an instrument for preventing danger, not for expressing displeasure or haste. Within a built-up area the only accepted reason for sounding the horn is to prevent a collision that is taking shape; the horn's second use — warning before overtaking — is permitted only outside built-up areas. The reason is both technical and environmental: outside town, on narrow roads with limited visibility and blind bends, an overtaking driver has no other reliable way of announcing his presence; but in town the density of vehicles and pedestrians is high, numerous horns lose their warning meaning and create noise pollution, so the law confines its use to an emergency. The correct alternative for announcing your presence is flashing your headlights.

In Yerevan a great deal of horn use is heard, but what counts in the exam and on a penalty notice is this rule, not street custom.

• Confining the horn to an overtaking warning removes its principal and always-permitted use, the prevention of a collision; an overtaking warning has no place in this situation either. • The "both" option treats convenience-driven use of the horn as permitted too, whereas in this situation the only accepted reason is the prevention of a collision.

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