Homonym: red lights (Warnings)
Red lights are signals used in traffic control to indicate that vehicles must stop. They are typically found at intersections and pedestrian crossings to ensure safety. When a red light is illuminated, drivers and cyclists must come to a complete stop until the light changes to green.
In addition to traffic signals, red lights are also used in various applications, such as in photography and theater. In photography, red lights help to preserve night vision while developing film. In theater, red lights can create dramatic effects or indicate specific cues for actors and stage crew.