Correct answer
By repeatedly using the brake lights.
Repeated use of brake lights under Article 109.2.c. Short, quick up-and-down arm movements are also allowed. The warning lets others adapt their driving; it does not require them to change lane. Do not delay urgent braking. The horn does not replace this optical warning, though it may be used to avoid a possible crash under Article 110 conditions.
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By moving the arm from left to right with sweeping movements.
By using the horn.
By repeatedly using the brake lights.
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