Sequenced Flashing Lights (SFL) operation is required when visibility is less than how many miles?

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Multiple Choice

Sequenced Flashing Lights (SFL) operation is required when visibility is less than how many miles?

Explanation:
Sequenced Flashing Lights are used to provide extra warning when sight distance to a crossing is reduced. The rule is to operate SFL whenever visibility falls below three miles. This threshold gives enough lead time for drivers and pedestrians to notice the approaching train and react, even in adverse weather, by using a more attention-grabbing, sequential light pattern. The sequencing makes the warning more conspicuous than standard flashers, which helps compensate for the reduced visibility. If visibility is three miles or more, the normal warning signals are sufficient; when it’s under three miles, activating SFL enhances safety.

Sequenced Flashing Lights are used to provide extra warning when sight distance to a crossing is reduced. The rule is to operate SFL whenever visibility falls below three miles. This threshold gives enough lead time for drivers and pedestrians to notice the approaching train and react, even in adverse weather, by using a more attention-grabbing, sequential light pattern. The sequencing makes the warning more conspicuous than standard flashers, which helps compensate for the reduced visibility. If visibility is three miles or more, the normal warning signals are sufficient; when it’s under three miles, activating SFL enhances safety.

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