Correct answer
By flashing the lights or sounding the horn.
With a non-shrill acoustic warning to avoid the possible crash, without unjustified or excessive use, or prescribed light flashes without dazzling, under Articles 109 and 110. This does not authorise routine horn use for every joining vehicle or replacing due precautions and cooperation with a warning. Light flashes do not automatically grant priority or permission to join.
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Only by sounding the horn.
Only by flashing the lights.
By flashing the lights or sounding the horn.
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