What is a potential hazard associated with using flares as warning devices?

Using flares as warning devices presents several hazards, with one significant concern being their combustible nature. Flares burn brightly to signal warning to other drivers, but this also means they pose a fire risk if they come into contact with flammable materials or are improperly handled.

Given that flares can ignite easily and burn for several minutes, if they are placed near dry grass, leaves, or other combustible materials, they could potentially start a fire. This is particularly problematic in environments where there are dry conditions or other flammable substances nearby, making it crucial for users to handle flares carefully and place them at a safe distance from such hazards.

While visibility concerns and effectiveness in adverse conditions are valid considerations when choosing warning devices, the inherent fire risk associated with flares is a primary reason for caution in their use. Reflective triangles and other modern warning devices often provide safer alternatives without the risks associated with combustion.