Where must lighted fusees not be left due to fire hazard?

Lighted fusees must not be left on bridges and trestles due to the significant fire hazard they pose in these locations. Bridges and trestles are often made of wood or contain other flammable materials that can easily ignite from the burning fusee. The elevated nature of these structures also makes it challenging to control or extinguish a fire should it start, potentially leading to dangerous situations for both train operations and surrounding environments.

In contrast, while leaving lighted fusees on the ground, in tunnels, or on platforms may also pose risks, bridges and trestles are particularly vulnerable to fire due to their construction and location, increasing the importance of strict compliance with safety protocols in these areas. Therefore, it is crucial to ensure that lighted fusees are properly discarded in a safe manner, minimizing the risks associated with fire hazards in sensitive infrastructure areas.