The overall objective of this experimental investigation of pedestrian/vehicle impacts was to conduct representative impacts of unembalmed cadavers in order to ( 1 ) pioneer the establishment of impact tolerance levels for the pelvis and legs of a standing pedestrian and ( 2 ) explore the ability of a few selected geometry and compliance modifications to the impacting vehicle to increase the impact velocities that can be tolerated. A series of 15 experimental impacts were conducted which covered a speed range from 10 to 30 mph. Dynamic data obtained included high-speed films and time histories of ( 1 ) bumper and hood edge forces, ( 2 ) horizontal and vertical ground reaction forces, and ( 3 ) pelvic acceleration. The resulting injuries were determined from examination of pre- and post-impact X-rays and detailed pathological dissections, and were assessed as to probable temporary total and permanent partial disabilities. Three of the key results are that ( 1 ) injuries to the lower body of an adult pedestrian are strongly dependent upon vehicle design, ( 2 ) the pedestrian leg injury mechanism is a complex dynamic event influenced significantly by both the bumper force and the ground friction force, and ( 3 ) a threshold tolerance value of pelvic acceleration appears to exist below which pelvic injuries do not occur.