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In traffic signals, the color used for caution is yellow. This color serves as a warning to drivers, indicating the need to slow down and be alert to potential hazards ahead. Yellow signals are typically found in various situations, such as traffic lights and warning signs, where care and attention are required. For example, a yellow traffic light prompts drivers to prepare to stop, while yellow signs alert them to dangers such as curves or school zones.

The use of yellow for caution is standardized in traffic regulations to ensure consistency and understanding among all road users. It plays a crucial role in promoting safety and preventing accidents by providing clear visual cues that convey important information about road conditions and the actions that drivers should take.