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Rows of amber lights read by angle alone.
Also known as: PL signal, Amber row signal
A North American signal carrying its aspect entirely in the angle of a row of same-coloured lights.
Carries its aspect entirely in the angle of a row of lamps, all of one colour.
Contexts: Public information
Removes colour from the signal completely, taking the colour position light's principle to its conclusion and producing a signal no colour vision defect can misread.
Contexts: Public information
A row of lamps of one colour lit together on a vertical, horizontal or diagonal line, the angle being the whole of the indication.