danger signal

英語（米国） (en-US) 英語（イギリス） (en-GB)

名詞

未分類 比喩的用法

(rail transport) A signal set at danger and showing a red light or other stop indication, which a train driver must not pass until it changes or until manually cleared past the signal by a dispatcher.

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The driver halted the train at the danger signal and contacted the dispatcher for clearance before proceeding.

詳細

意味（1）

(rail transport) A signal set at danger and showing a red light or other stop indication, which a train driver must not pass until it changes or until manually cleared past the signal by a dispatcher.

On a train travelling at say 40 miles per hour a driver would have to react quite quickly to bring his train to a halt at a danger signal even if he could see that signal half a mile away.

詳細

意味（2）

(also figurative) An indication that a potentially bad or dangerous situation could develop.

danger signals （ plural ）