Traffic-light signalling and operation

Swedish traffic light (left) for use by public transport vehicles only. All signals use white lighting and special symbols (

Left and through signals on a 'J-arm' in Orinda, California

A pole-mounted flashing left turn signal in Oregon

Horizontal Dallas display viewed from the left turn bay

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.

单词	Ball signal
释义	Ball signal 英语百科 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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Ball signal

Traffic-light signalling and operation