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In order to improve the active safety and the aerodynamic drag a special rear end configuration was developed for the Porsche 911 (4)+. Typical sequences of movements were determined during impact tests in the course of which dummies were hit by various rear end variants. It was stated that some pedestrians and cyclists incurred direct abdominal impacts. To find out whether under real traffic situations and in a speed range of 16 through 24 km/h this type of collision results in intraabdominal injuries, 12 corresponding test series with Göttingen minipigs were carried through in the course of which the test animals were projected against various rear end variants. Measurements were made to determine the forces and accelerations acting on the respective rear end. The acceleration to which the animal was subjected was measured by means of an acceleration sensor sutured to the test subject's back. In addition the point of impact on the animal's body was determined.