INLAND ONLY While underway you sight the lights shown in illustration D081RR below with the yellow lights flashing. The lights displayed should have which of the following characteristics?

Correct Answer: Option D — visible at night and during periods of restricted visibility

Under 33 CFR 83.27(b), the lights indicating the side of a dredge pipeline or obstruction must be visible at night and during periods of restricted visibility. These lights are essential for safe navigation in inland waters to identify safe passage channels around dredging equipment.