Which of the following is NOT a cause of vehicle fires?

Low tire pressure is not a direct cause of vehicle fires. While low tire pressure can lead to tire blowouts or other mechanical failures, it does not inherently create a fire hazard. Vehicle fires are usually associated with flammable materials and situations where heat is generated without proper ventilation or control.

On the other hand, spilled fuel poses a clear fire risk as it can ignite if exposed to an ignition source. Improper use of flares can also lead to fires, especially if flares are placed too close to flammable materials or if they are not used as intended. Smoking while fueling creates an immediate fire danger due to the presence of flammable vapors that gasoline emits, making this behavior particularly hazardous.

Understanding these distinctions highlights the importance of safety measures when dealing with fuel and vehicle maintenance to prevent fire hazards.