What type of light signifies danger on Aids to Navigation?

A flashing red light on Aids to Navigation serves as a universal signal indicating danger or a hazard in the waterway. It is crucial for mariners to recognize this form of marking, as it helps to identify potentially unsafe conditions, such as the presence of shallow waters, submerged rocks, or hazardous obstructions. The design of these red lights is intentional, as the color red is typically associated with caution or an immediate alert.

In contrast, a flashing yellow light may indicate caution or a point that requires attention but does not signify danger as directly as a flashing red light does. A steady green light usually denotes safe passage or confirms a navigable channel, while a steady white light often indicates a safe harbor or a landmark but lacks the urgency communicated by the flashing red signal. Understanding these color signals is essential for safe navigation and helps prevent accidents on the water.