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An escape route marked at floor level.
Also known as: LLL system, Photoluminescent escape marking, Floor level escape marking
The IMO system marking escape routes with photoluminescent strips near the deck, readable when smoke fills the upper part of a space.
Marks a continuous escape route at low level along corridors and stairways.
Contexts: Public information, Navigation
Placed low because smoke banks down from the deckhead, so signage at eye level disappears exactly when it is needed; the system is a direct response to the loss of visibility in a fire.
Contexts: Public information, Navigation
Adopted internationally after fires in which crew and passengers could not find exits in smoke, so the requirement is a documented consequence of specific casualties rather than a general precaution.
Contexts: Public information, Navigation
A continuous glowing strip or a line of closely spaced markers running along the deck or the lower part of a bulkhead, with arrows at changes of direction.