in the opposite direction. It was held that both the owner of the truck and the car proceeding in the same direction in which the truck was parked were liable. Where a second actor has become aware of the existence of a potential danger created by the negligence of an original tort-feasor, and thereafter by an independent act of negligence brings about an accident, the first tort-feasor is relieved of liability because the condition created by him was merely a circumstance of the accident and not its proximate cause. Where, however, the second actor does not become apprised of such danger until his own negligence, added to that of the existing perilous condition, has made the accident inevitable, the negligent acts of the two tort-feasors are contributing causesthat is reasonably possible, any obstacle in his way, and bring his car to a stop before a collision with said object.
In the case of Buohl v. Lockport Brewing Co., 349 Pa. 377, 37 A.2d 524, the plaintiff was riding as a guest in the motor vehicle which collided with an unlighted tractor-trailer parked on the highway. It was claimed that the accident occurred due to the fact that the driver of the motor vehicle, in which the plaintiff was riding, was blinded by the lights of an approaching vehicle and upon regaining his vision, the unlighted tractor-trailer was approximately 20 to 25 feet ahead. The driver of the motor vehicle swerved his car sharply to the left but the right front corner of his car came in