A bridge over a navigable waterway is being repaired. There is a traveler 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?

Correct Answer: Option C — A quick flashing red light at each lower corner

When bridge maintenance equipment like a traveler platform reduces vertical clearance, the USCG District Commander may mandate specific lighting for safety. Quick flashing red lights at the lower corners of the obstruction provide a high-visibility warning to approaching vessels, clearly marking the reduced clearance and preventing potential allisions.