When is it considered safe to cross train tracks?

The correct answer, indicating that it is considered safe to cross train tracks only when the lights are not flashing and it's clear, emphasizes the importance of being attentive to warning signals at train crossings. The flashing lights are a critical safety measure designed to alert drivers that a train is approaching. When the lights are flashing, it means that a train is either on the track or very close to arriving, and crossing at that time could lead to a dangerous situation.

Therefore, you should only proceed across train tracks when it is confirmed that the lights are off, which signifies that no train is approaching, and the tracks are clear. This practice ensures that drivers maintain the highest level of safety when navigating railroad crossings.

The other options, while they might seem plausible, do not provide the necessary caution. Simply seeing a train does not give enough information about when it is safe to cross, as trains travel at high speeds and can be deceivingly far when first spotted. Crossing during daylight or assuming safety based on distance alone without proper signals can lead to injury or fatal accidents. It is crucial to follow the specific signals at train tracks for optimal safety.