How must an absent or imperfectly displayed signal be regarded?

An absent or imperfectly displayed signal must be regarded by the most restrictive indication possible because this approach ensures the safety of both personnel and equipment. Interpreting such signals in a restrictive manner mitigates the risk of accidents or mishaps that could occur due to misinterpretation of the signal's intent.

When signals are not properly displayed or are missing, relying on the most conservative interpretation serves as a safeguard, prompting operators to proceed with heightened caution. This means they need to reduce their speed and be prepared to stop, as they cannot assume that the track or conditions are safe for normal operation. The principle of prioritizing safety through conservative action in the face of uncertainty is a fundamental aspect of operational rules.

Recognizing a signal as a proceed or caution signal may lead to dangerous situations if the signal is not functioning properly. Not having any effect on movement would disregard the critical role of signaling in safe operations, thereby increasing the risk of accidents. Therefore, interpreting an absent or imperfectly displayed signal in the most restrictive manner is essential for maintaining a safe operating environment.