单选题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?（）AIllumination by flood lightsBA quick flashing red light at each lower cornerCA strobe light visible both up and downstreamDFixed amber lights under the extreme outer edges of the traveller
单选题
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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