Which of the following is true regarding the use of fixed signals in track occupancy?

The use of fixed signals in track occupancy is a crucial aspect of safe railway operations. Fixed signals are specifically designed to provide essential information to roadway workers and train crews regarding the status of the tracks and the need for caution in certain situations. When signals are illuminated or displayed in a specific manner, they communicate various operational conditions, such as whether the track is clear or if workers need to exercise care when approaching specific areas.

Option B is correct because fixed signals serve as an important reminder for crew members to remain vigilant and adhere to safety protocols while on or near the tracks. The presence of a fixed signal instructing caution indicates that there may be potential hazards ahead, such as slow-moving trains or other unforeseen conditions that could pose risks to roadway workers.

Other choices do not reflect the appropriate role of fixed signals. Notably, fixed signals should never be disregarded, as ignoring them can lead to dangerous situations. They are not limited to yard activities; they are used across various operating scenarios on the mainline as well. Lastly, while fixed signals do dictate crew movements, their instructions must always be contextualized within the current environmental and operational conditions, so they do not operate in a vacuum regardless of those factors.