If you . see one or two alternately flashing red lights, what should you do ?
Proceed with extreme caution because there is a danger .
Find another way because the one marked with red lights is totally closed to traffic .
Stop me, because they temporarily prohibit the passage before a level crossing, entry to a mobile bridge or a ferry gate, in the vicinity of a fire-fighting vehicle exit or due to the approach of an aircraft at low altitude <2 >