Final answer:
At a crossroad with an approaching train, stop and remain stationary until the train passes. This is a safety measure to avoid the dangers posed by the train's speed and the suction effect caused by the change in atmospheric pressure. Traffic signals also play a critical role in ensuring pedestrian safety at intersections.
Step-by-step explanation:
When you arrive at a crossroad and a train is approaching, you should stop moving and become stationary till it passes by. This is crucial for pedestrian safety, as trains can be extremely dangerous due to their size, speed, and the considerable distance they require to come to a stop. If you are close to the tracks, there is also a risk of being pulled towards a rapidly moving train due to changes in atmospheric pressure as the train passes. It is always best to wait until the train has gone, and the crossing signals, if present, indicate that it is safe to proceed.
In terms of pedestrian safety at intersections, a traffic signal can provide a safe way for pedestrians to know when it is appropriate to cross the street without having to dodge traffic. Following traffic signals, road signs, and exercising caution are the best ways to protect oneself as a pedestrian.