When might an imperfectly displayed signal not be regarded as displaying its most restrictive aspect?

An imperfectly displayed signal may not be regarded as displaying its most restrictive aspect when insufficient lights are present, but the aspect can still be positively determined. This means that even if the signal does not appear to be functioning perfectly (for example, some lights may be out or obscured), if the engineer can still determine what aspect the signal is displaying with certainty, it can be treated as the aspect that is displayed.

This understanding is critical within the context of LIRR operations, as it emphasizes the importance of clarity in signal indication. If an engineer can accurately read the signal despite some imperfections, it allows for safe and effective train operation based on that clear reading rather than defaulting to the assumption of the most restrictive aspect. This approach promotes active engagement and attentiveness on the part of the engineer, ensuring that decisions are made based on the actual signal information available rather than a blanket rule regarding signal failures.

In instances where the signal is reported to be out of order or checked by the engineer without being able to positively determine its aspect, those situations do not necessarily provide the same clarity as a situation where the aspect can be confidently identified, which further affirms why "A" is the best choice.