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Discover LudwigThe phrase "a warning light" is correct and usable in written English.
It can be used to refer to a signal or indicator that alerts someone to a potential problem or danger, often in the context of machinery or vehicles.
Example: "When the engine starts to overheat, the dashboard will display a warning light to alert the driver."
Alternatives: "alert signal" or "indicator light".
Exact(60)
The Mercedes and Lexus systems warn the driver, with a warning light and audible signal, when it is time to intervene.
The agency also dismissed Ford's argument that a warning light would be enough to warn the driver of a problem.
An electric control unit (ECU) picks up the signal, and a warning light on the automobile's dashboard warns a driver when tire pressure has dropped.
That would set off a warning light.
The driver would be alerted by a warning light.
A warning light that only does one job.
A warning light turns orange when your batteries are running low.
The concept of detecting animals that then trip a warning light is relatively straightforward.
The whole idea of a warning light or warning bell may not work".
The whole idea of a warning light or warning bell may or may not work".
This old term of praise is, today, more like a warning light.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com