What would be considered a safety breach at a level crossing?

Using mobile devices while waiting at a level crossing is considered a safety breach because it distracts the driver and compromises their ability to stay alert to their surroundings, specifically oncoming trains. At level crossings, vigilance is crucial, as trains can approach without warning. By using a mobile device, a driver may miss important signals or sounds indicating the presence of a train, leading to potentially dangerous scenarios. Awareness and attentiveness are vital for ensuring personal safety and the safety of others at these intersections.

The other options, such as stopping at the crossing, waiting for a green light, and observing the crossing for trains, are responsible behaviors. Stopping ensures that the driver does not enter the crossing while a train is approaching, waiting for a green light indicates compliance with traffic signals, and actively observing for trains demonstrates the necessary caution to prevent accidents.