How should an imperfectly displayed signal be regarded?

An imperfectly displayed signal should be regarded as displaying its most restrictive aspect to ensure the safety of train operations. This approach prioritizes caution; by interpreting an unclear signal as the most restrictive indication, the operating crew maintains a conservatively safe posture while approaching the signal.

The rationale behind this rule stems from the operational need to minimize the risk of misunderstandings that could lead to accidents. If a signal is not displaying correctly, it is prudent to err on the side of safety by treating it with the strictest restrictions. This practice aligns with the principles of safety management in railway operations, where the priority is to safeguard passengers and crew.

Consequently, treating an imperfectly displayed signal as an advisory or as needing further inspection may introduce risks by allowing for potentially hazardous actions based on uncertain information. Adopting a clear and consistent approach to uncertain signals enhances overall safety and promotes adherence to established protocols in train operations.