What color light is typically used to indicate a drawbridge in a closed position?

A drawbridge in a closed position is indicated by a red light. This signaling is crucial for the safety of vessels and vehicles in the area, as the red light clearly communicates that the drawbridge is not open for passage. The use of red as a warning color is consistent across many types of navigational signaling and traffic safety applications, making it widely recognized. Thus, when a navigation light is red, it instructs mariners to remain alert and refrain from attempting to cross under the bridge until the light changes, indicating that it is safe to proceed.