The aims of this study were to appreciate the prevalence of chronic low back pains in a public transport's company, to state characteristics and to identify categories of workers involved and medico-legal consequences. It is a cross sectional study. which used medical records of the occupational clinic. All workers who complained of low back pain in the past three years following the study were selected. Characteristics of workers, types of injuries, occupational and medico-legal consequences were looked out. Sixty nine cases were collected, they were exclusively males. 54 % of them were bus drivers, and 29% conductors. X rays abnormalities were found in 31.64%. Exposure to vibration due to damaged roads and decayed vehicles seems to be main etiologic factors. From a occupational and medico-legal standpoint, two patients were reported for workers compensation, three patients were reclassified in another job. Undamaged roads, ergonomic design of bus' seats, and medical screening during placement and routine medical examination are key issues in preventing low back pains.