A bridge over a navigable waterway is being repaired. There is a traveller platform under the bridge’s deck that significantly reduces the vertical clearance. If required by the CG district commander，how will this be indicated at night?（）<br>A:Illumination by flood lights<br>B:A quick flashing red light at each lower corner<br>C:A strobe light visible both up and downstream<br>D:Fixed amber lights under the extreme outer edges of the traveller

A bridge over a navigable waterway is being repaired. There is a traveller platform under the bridge’s deck that significantly reduces the vertical clearance. If required by the CG district commander，how will this be indicated at night?（）
A:Illumination by flood lights
B:A quick flashing red light at each lower corner
C:A strobe light visible both up and downstream
D:Fixed amber lights under the extreme outer edges of the traveller

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