Rules of the Road · Light Identification — Constrained by Draft
Under International Rules, a vessel showing three all-round red lights in a vertical line in addition to normal power-driven lights is:
- ANot under command
- BRestricted in ability to maneuver
- CConstrained by her draft✓ Correct
- DAground
Explanation
Three all-round red lights in a vertical line indicate a vessel constrained by her draft. She also carries the normal masthead, side and stern lights of a power-driven vessel.
Authority: COLREGS Rule 28 (International)
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