Correct answer
At very short intervals.
Use flashes at very short intervals and avoid dazzle, under Article 109.3. Light warnings may replace audible warnings for their prescribed purposes, including in built-up areas. Do not use a continuous beam to demand passage or dazzle others. Dipped headlights, or both alternately, may also be used.
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At very short intervals.
With a continuous light signal prolonged over time.
With long, intermittent signals.
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