Questionnaires on low back and neck–shoulder pain intensities and subjective perception of fatigue were assessed by visual analogue scales (100 mm VAS [29]). Every subject evaluated his/her back and neck–shoulder pain, and fatigue intensities on a 100-mm where 0 denoted no pain or fatigue at all, and 100 the worst possible pain or fatigue. The result was given in millimetres. Low back pain induced disability was assessed by Oswestry disability index (ODI 0–100 [30]). The additional questionnaires for pain and fatigue intensities were filled before and after every driving session. Questionnaire included also pain during driving and a question whether the drivers benefited of the low back support or not.