colour light signal

== English == === Noun === colour light signal (plural colour light signals) (rail transport, British spelling) An electric railway signal with colour aspects, showing either red or green in a 2-aspect signal, with the addition of a yellow or double yellow aspect (meaning caution) in 3- and 4-aspect signals. Synonym: colour light ==== Alternative forms ==== colour-light signal, color light signal, color-light signal ==== Translations ==== === References === “colour light signal”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022.