How should auxiliary lights operate at public crossings according to regulations?

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The operation of auxiliary lights at public crossings is crucial for ensuring safety and visibility for both train operators and road users. According to regulations, auxiliary lights are designed to enhance the warning signal when a train approaches a crossing. The correct choice indicates that these lights should flash alternately when a train is about to cross.

Flashing auxiliary lights serve to attract attention and warn motorists and pedestrians of the train's approach, thereby reducing the likelihood of accidents. This operation mimics the action of warning lights used in other traffic scenarios, ensuring drivers remain alert to the potential danger.

In contrast, having all lights turned off until needed would undermine their purpose of providing advance warning. Steady lights do not convey urgency and can easily be overlooked in bright daylight conditions. Operational requirements that state only one light needs to be operational would also fail to provide adequate warning, as multiple functioning lights flashing in an alternating pattern create a more noticeable alert for those near the crossing.

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