The author analyzed a group of 156 pedestrians (70 men and 86 women) above 50 years (Me = 72 years in men and 72.5 years in women) who died in 1967-1972 as a result of traffic accidents in the catchment area of the University Hospital in Prague 10. Head injuries were recorded in 73%, injuries of the chest in 62%, of the abdomen in 30%, of the spine in 26%, of the pelvis in 52%, of the upper extremities in 26% and of the lower extremities in 51% of the injured. In 20 (12.8%) a single injury was involved, in 136 (97.2%) multiple injuries, most frequently injuries of three parts of the body were observed - in 43 (27.5%) of the injured. The curve illustrating the number of surviving subjects in relation to the time which had elapsed since the injury displayed two definite and two indicated inflexions suggesting increased lethality. The first definite inflexion was between the second and third hour after injury and in those who died during this period fractures of the spine, bones of the lower extremities and pelvic bones with retroperitoneal bleeding were more frequent. The second definite inflexion was 36-48 hours after injury and in the patients pulmonary complications (atelectases, incipient inflammations) were more frequent. The indicated inflexion which was on the 9th day after injury was due to bronchopneumonias which were often observed at that time. Due to the small number of observations the authors were unable to interpret the infexions found on the 7th and 11th day after injury.