The set of red, yellow and green lights at a road junction that tells drivers when to stop and go. This is mainly American English — in America, stoplight and traffic light are both completely normal, with stoplight sounding a bit more casual and more common in everyday speech and in giving directions ('turn left at the second stoplight'). British speakers say traffic lights almost always, and would find stoplight noticeably American.

The set of red, yellow and green lights at a road junction路口那組紅黃綠燈， that tells drivers告訴駕駛人 when to stop and go什麼時候該停、什麼時候該走。 This is mainly American English這主要是美式英文—— in America, stoplight and traffic light are both completely normal在美國stoplight和traffic light都完全正常， with stoplight sounding a bit more casual只是stoplight聽起來比較隨性一點， and more common in everyday speech and in giving directions在日常說話和指路時也更常用 ('turn left at the second stoplight')（例如『turn left at the second stoplight』，在第二個紅綠燈左轉）。 British speakers say traffic lights almost always英式英文的人幾乎都說traffic lights， and would find stoplight noticeably American聽到stoplight會明顯覺得這是美式說法。

The word can also mean the red brake light on the back of a car, though most people now say brake light for that. Note that Americans measure distance by them: 'it's three stoplights down' means three junctions away, not three lamps.

The word can also mean這個字也可以指 the red brake light on the back of a car車子後面的紅色煞車燈， though most people now say brake light for that不過現在大多數人都說brake light來指那個。 Note that Americans measure distance by them要注意美國人會用它們來量距離： 'it's three stoplights down'『it's three stoplights down』（往前三個紅綠燈） means意思是 three junctions away, not three lamps三個路口那麼遠，不是三盞燈。

Written as one word; stop light as two is also seen but less common.

Written as one word寫成一個字stoplight； stop light as two is also seen分開寫成stop light兩個字也看得到， but less common但比較少見。