Question 391Navigation General70% to pass
You are downbound approaching a lock and see 3 green lights in a vertical line. This indicates _______________.
AI Explanation
The correct answer is D) the upstream end of the river wall.
The display of 3 green lights in a vertical line indicates the upstream end of the river wall, which marks the entrance to the lock chamber. This is the signal that the lock is open and ready to receive your tow.
The other answer choices are incorrect. Option A is wrong because 3 green lights indicate the lock is open, not that you should hold up. Option B is incorrect because the 3 green lights do not specifically indicate the lock chamber is open, just the entrance. Option C is wrong because the 3 green lights mark the river wall, not the land wall.
Related Questions
#389 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? #390 You are upbound approaching a lock and dam and see two green lights in a vertical line. This indicates _______________.#392 Restricted areas at locks and dams are indicated by _______________.#393 Permission to enter the riverward chamber of twin locks is given by the lockmaster and consists of which sound signal? #394 You are approaching Gallipolis Lock and Dam. The traffic signal light is flashing red. You should _______________.