. . . . . . . . . . . . . . . . . . . . . "5508817"^^ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . "which?"@en . . . . . . . . . . . . . . . . . . . "1120467406"^^ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . "In traffic engineering, there are regional and national variations in traffic light operation. This may be in the standard traffic light sequence (such as the inclusion of a red-amber phase) or by the use of special signals (such as flashing amber or public transport signals)."@en . . . . . . . . . . . . . . . . "55539"^^ . . . . . . . . . . . . . . . . . . . "In traffic engineering, there are regional and national variations in traffic light operation. This may be in the standard traffic light sequence (such as the inclusion of a red-amber phase) or by the use of special signals (such as flashing amber or public transport signals)."@en . . . . . . . . . . . . . "March 2020"@en . . . . "Variations in traffic light operation"@en . .