What color is predominantly used in danger signs where an immediate hazard exists?

The predominant color used in danger signs indicating an immediate hazard is red. Red universally signifies immediate danger and is often associated with stop signals, fire safety, and emergency situations. This color draws attention quickly and is recognized as a warning to take urgent action. Red's high visibility makes it suitable for alerting individuals to potentially life-threatening hazards, ensuring that anyone in the vicinity is aware of the danger and can respond accordingly.

Yellow, while also used for caution signs regarding less urgent hazards, does not convey the same level of urgency that red does. Similarly, orange is often used for warning signs, particularly in construction and hazardous equipment areas, but it does not carry the same immediate danger connotation as red. Lastly, white is typically associated with informational signs rather than indicating hazards. Thus, red's role in signaling immediate danger makes it the correct choice in this scenario.