Under what condition must conductors complete a daily safety briefing?

Conductors must complete a daily safety briefing whenever conditions change affecting safety because this practice ensures that the safety protocols are always up to date in response to the current environment. Changes in conditions can include variations in weather, track conditions, equipment status, or other situational factors that might impact the safety of operations. By conducting a safety briefing under these circumstances, conductors can be made aware of any new hazards or changes in procedures that they need to consider during their work, ultimately promoting a safer work environment. This approach emphasizes proactive communication and situational awareness, both of which are essential for maintaining safety standards in any operational setting.