Inland · Rule 15
Crossing Situation
Last verified: 2026-05-16
TL;DR
When two power-driven vessels are crossing so as to involve risk of collision, the vessel which has the other on her own starboard side shall keep out of the way and shall, if circumstances admit, avoid crossing ahead of the other.
Why it shows up on the exam
Mnemonic: 'green over green, no problem seen' is wrong — green-on-your-starboard means you are the give-way vessel.
Inland-specific notes
Inland Rule 15(b) gives a power-driven vessel crossing a Western River or the Great Lakes the right-of-way if the other is descending the river.
Authoritative source
Source links checked against the current public rule corpus on 2026-05-16.
International parallel
COLREGs Rule 15 — Crossing Situation →More from Part B-II — In Sight of One Another
Related drills
Drill Inland Rule 15
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