When there is a warning signal at a railway crossing, what is the correct action?

Answer: B — Stop not less than 5 m from the nearest rail

At a railway crossing, when a warning signal is activated, it indicates that a train is approaching and you must stop your vehicle to ensure your safety. Stopping at least 5 meters from the nearest rail allows sufficient distance to avoid any potential danger from an oncoming train, ensuring that you are clear of the tracks and allowing for proper visibility of the train. Waiting and observing the signal is crucial, as it is designed to prevent accidents by providing a clear indicator of when it's safe to cross. By stopping at the designated distance, you are following the safety regulations and protecting yourself and any passengers from harm. Always prioritize caution and adhere strictly to railway crossing signals, as they are essential for preventing collisions with trains, which can have devastating consequences.