When providing warning signals, employees must use:

When providing warning signals, employees must use:

• A. Red flag or fusees during the day. White light or red fusees at night or during the day when signals cannot be plainly seen.
• B. Sound the horn continuously at all times.
• C. Green lanterns on all trains.
• D. Only whistle signals regardless of visibility.

Answer: (A)

The key idea is that warning signals must be clearly visible to those approaching on the tracks, and the signaling method changes with lighting and visibility conditions. During the day, red flags or red fusees are used to clearly denote a warning or hazard. At night, or when signals aren’t easily seen, a white light or a red fusee is used so the warning can be seen from a distance. This combination ensures consistent, unmistakable notice to train crews and workers regardless of light or weather. Relying on the horn alone isn’t sufficient because sound signals can be drowned out, misheard, or not easily associated with a specific hazard at a distance. Green lanterns on trains aren’t part of standard warning practice, and restricting signals to whistle signals regardless of visibility ignores the need for visible warnings when visibility is poor.

The key idea is that warning signals must be clearly visible to those approaching on the tracks, and the signaling method changes with lighting and visibility conditions. During the day, red flags or red fusees are used to clearly denote a warning or hazard. At night, or when signals aren’t easily seen, a white light or a red fusee is used so the warning can be seen from a distance. This combination ensures consistent, unmistakable notice to train crews and workers regardless of light or weather.

Relying on the horn alone isn’t sufficient because sound signals can be drowned out, misheard, or not easily associated with a specific hazard at a distance. Green lanterns on trains aren’t part of standard warning practice, and restricting signals to whistle signals regardless of visibility ignores the need for visible warnings when visibility is poor.