What is a common cause of vehicle fires?

Collisions are a well-documented cause of vehicle fires, as they can lead to significant damage to a vehicle's fuel system, electrical components, or engine, all of which may ignite. During a collision, the impact can puncture fuel lines and tanks or compromise electrical systems, creating sparks or heat sources that could ignite fuel. Collisions may also cause debris, like broken glass or metal, to come into contact with hot engine components, adding to the risk of a fire.

Other factors, while significant in different contexts, do not directly lead to vehicle fires as consistently as collisions do. Heavy rain may contribute to accidents but doesn't inherently cause fires. Low visibility can also lead to accidents but isn't a direct factor for fires. Excessive speed increases the likelihood of accidents and could lead to collisions, but isn't a standalone cause of fire. Thus, collisions are the most common and direct cause of vehicle fires.