A lock gate is moving and red plus green entry lights show. What is the correct decision?
Short answer
Prepare but remain outside until green alone or an express lock-staff order permits entry
Red and green together is a preparation state in which entry remains prohibited. Gate movement and another vessel's action cannot replace the signal or an express instruction for your transit. Revisit Classify the Control Before Moving.
Quick check
A lock gate is moving and red plus green entry lights show. What is the correct decision?