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Seat belt sign (SBS) is frequently seen as a clinical finding in motor vehicle accidents. The purpose of this study is to determine the diagnostic value of SBS. All adult patients presenting with an history of motor vehicle accident to a tertiary care university hospital emergency department was included in this prospective, observational study covered the time period between July 01, 1999 and February 01, 2000. 213 patients were included in this study; 135 (63.4%) were male, and 76 patients (35.7%) were seat-belted. SBS was seen on 27 (35.5%) belted patients. Fourteen of seat-belted had rib fractures nine of those patients with rib fractures were found to have SBS. There was a statistically significant difference between the patient groups with or without SBS in rib fractures (p = 0.0128) While no significant differences were detected between groups regarding the frequency of intra-cranial, intra-thoracic, intra-abdominal and extremity injuries three of four patients who had sternum and clavicular fractures took place in SBS(+) group (p = 0.090). The presence of SBS in trauma patients may create a high index of suspicion for thoracic injuries, especially for rib fractures. It is widely accepted that any delay in the diagnosis may increase morbidity and mortality following thoracic injuries. Further studies are needed to investigate the possible role of SBS in the prediction of the severity of injuries following thoracic trauma.