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BDifficulty 2/5

What does one flashing red light or two alternately flashing red lights in a vehicle traffic signal indicate?

Correct answer

They temporarily prohibit vehicles from passing.

They temporarily prohibit passage. Annex I, section 4.2.b, provides for this signal at level crossings, entrances to movable bridges or pontoon ferries, near fire-vehicle exits or for low-flying approaching aircraft. Do not interpret it as flashing amber allowing cautious progress. Wait until passage is no longer prohibited and proceed only when safe.

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  • They grant absolute priority to cross the location.

  • They temporarily prohibit vehicles from passing.

  • They allow passage without stopping, merely exercising extra caution.

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