IMO's Maritime Safety Committee has adopted an earlier recommendation that ships display 3 all-round green lights when crossing the Singapore Strait Traffic Separation Scheme (TSS).
The night signals identify these vessels crossing the TSS during hours of darkness which will allow other vessels in the appropriate lanes to take actions if required, thereby enhancing navigational safety.
The IMO’s Maritime Safety Committee at its ninety-first session in Nov 2012, in accordance with the provisions of resolution A.858(20), adopted the proposal to recognise the measure as a full-fledged recommendatory measure (i.e. it is no longer an interim measure) with effect from 1 June 2013 at 0000hrs UTC (0800hrs Singapore LT).
The night signals and the procedures remain unchanged. Ship owners, agents and masters of vessels are:
(a) To take note of the details regarding the display of the night signals set out in Appendix 1; and
(b) Recommended to comply with the procedures set out in Appendix 1 when intending to cross the TSS and precautionary areas in the Singapore Strait.
(The appendices refer to the applicable measure adopted by the IMO Maritime Safety Committee in 2011).