In Buzzelli v. Port Authority of Allegheny County, 674 A.2d 1186 (Pa. Cmwlth. 1996), the Court reversed and remanded with instructions for a new trial, stating that plaintiff's evidence, if credited, was sufficient to establish an unusual or extraordinary stop. Therefore, the Court held that the trial court should have charged the jury with a clear statement that an explanation from the carrier would be required if the testimony of the unusually hard stop, given all the circumstances, was sufficient to meet the threshold requirements under the "jerk or jolt" doctrine. Buzzelli, 674 A.2d at 1190.