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BDifficulty 2/5

At a level crossing, a signal shows two red lights flashing alternately. What do they mean?

Correct answer

Passage is temporarily prohibited at a level crossing

They temporarily prohibit vehicles from passing. Stop and wait until passage is permitted and safe. Annex I, section 4.2.b, gives this meaning to one flashing red light or two alternately flashing red lights. They are also used in other regulated situations, including movable bridges, ferry pontoons, fire-service vehicle exits or an aircraft approaching at low altitude. They do not mean the same as flashing amber.

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  • Passage is temporarily prohibited at a level crossing

  • Passage is permitted but with extreme caution

  • Passage is permitted as if it were a green light

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