In Connolly v. Philadelphia Transportation Company, 420 Pa. 280, 283, 216 A.2d 60, 62 (1966), a bus passenger sustained personal injuries when a truck cut in front of the bus on which she was riding, causing the bus to stop suddenly. Connolly, who had just stood up to disembark, "was thrown to the floor with such force as to render her unconscious." Connolly, 420 Pa. at 282, 216 A.2d at 62. Connolly presented testimony from another passenger that the bus had been traveling between 25 -- 30 miles per hour, swaying from side to side and passing other vehicles prior to the sudden stop. Id. at 284, 216 A.2d at 63. The jury concluded that the bus driver's speed was excessive under the circumstances and contributed to the injury.