American Truck Leasing, Inc. v. Thorne Equipment Co.
400 Pa. Super. 530 · Superior Court of Pennsylvania · 1991
Facts
A fire started in combustible trash on Dorothy Gross's vacant property, spreading to an adjacent building and damaging an elevator shaft. After the fire was extinguished, a demolition contractor, hired to remove the fire-damaged shaft, caused further damage to American Truck Lines' property. American sued Gross, alleging her initial negligence in allowing trash accumulation caused their harm.
Issue
Was Dorothy Gross's alleged negligence in allowing combustible trash to accumulate on her property a "substantial factor" in causing the damage to American Truck Lines' property, which occurred during the demolition of a fire-damaged structure the day after the fire was extinguished?
Holding
The court affirmed the trial court's decision, holding that Dorothy Gross's alleged negligence was not a substantial factor in causing American's harm. The damage occurred due to an independent intervening act of demolition after the fire was extinguished, breaking the chain of causation.
Rule
For negligence to be a legal cause, it must be a "substantial factor" in bringing about the harm, considering factors like other contributing forces, whether the conduct created a continuous force or a harmless situation acted upon by others, and the lapse of time. An independent intervening act can break the chain of causation.
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