What must occur before fouling a crossing equipped with automatic warning devices?

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Fouling a crossing equipped with automatic warning devices requires that the warning devices are properly functioning to ensure safety. This means that the lights are operational, and the gates are fully lowered. These automatic warning devices are designed to indicate to both pedestrian and vehicular traffic that a train is approaching the intersection, thus preventing accidents. If the warning devices are not operating correctly or the gates are not fully lowered, it poses a significant risk of a collision or an incident, as drivers or pedestrians may not be adequately informed of the train's presence.

The other options do not prioritize the effectiveness of the automatic warning devices, which are critical for maintaining safety at crossings. For instance, a specific train speed or the status of block signals does not guarantee protection for the crossing unless the warning devices are functioning properly. Additionally, merely alerting crew members does not equate to ensuring the safety of the public using the crossing.

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