How should a signal that is imperfectly displayed be regarded?

A signal that is imperfectly displayed should be regarded as displaying its most restrictive aspect because this approach prioritizes safety and caution in railway operations. When a signal is not clearly showing its intended indication due to defects, lighting issues, or other imperfections, the conservative rule is to assume that the signal conveys the worst-case scenario.

This interpretation is vital because it prevents a crew from possibly misjudging the signal's intended message, which could lead to unsafe situations, such as speeding when a train should be slowing or stopping. The general practice in railway operations is to err on the side of caution, especially when there is uncertainty regarding the signal's display. By treating the signal as displaying its most restrictive aspect, train crews can take necessary precautions, ensuring the safety of the train, crew, and passengers. This principle aligns with operational protocols aiming to minimize risks associated with ambiguous or unclear signals.