Why should a driver hauling hazardous materials avoid parking near open flames or sources of heat whenever possible?

Pick an answer

1. Parking near heat sources has no bearing on hazardous cargo safety in any situation
2. It matters only if the vehicle's engine is running
3. This precaution applies only to shipments of corrosive materials
4. Heat or an open flame nearby increases the risk of igniting a flammable cargo or vapor

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