Traffic-light Signalling And Operation
The use of traffic lights to control the movement of traffic differs regionally and internationally in certain respects. This article describes some of these non-universal features. Note that the color phase commonly known as "yellow" is often referred to, especially in official usage, as "amber"; for consistency this article uses "yellow" throughout.
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“It is critical vision alone which can mitigate the unimpeded operation of the automatic.”
—Marshall McLuhan (19111980)