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.
Sources and scope
Reviewed by Richard Moore on . This answer is scoped to european inland waterways; local rules still apply; check the current chart, publication, local rules and official operational guidance before acting afloat.
Quick check
A lock gate is moving and red plus green entry lights show. What is the correct decision?