If you see one or two alternately flashing red lights, what to do ? .
Stop me, because they temporarily prohibit the passage before a level crossing, entry to a mobile bridge, or a ferry pontoon, in the vicinity of a fire brigade exit or on the occasion of the approach of an aircraft at low altitude .
Advance with extreme caution, but without the obligation to stop .
Find another way, because the signposted in this way indicates that the road is completely closed to traffic .
Correct answer :a
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