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40ème congrès de la Société de Biomécanique, PARIS, FRANCE, 28-/11/2015 - 30/11/2015; An accurate prediction of driving posture is essential for an ergonomic assessment of the layout of vehicle interior, including the seat, steering wheel, pedals, and control and mirror locations. However, driving posture prediction is not so straightforward because of multiple available adjustments in modern vehicles and high anthropometric variability of drivers. For a vehicle, a driver can usually adopt multiple postures. In currently existing digital human modeling software packages, posture prediction is formulated as a global optimization problem trying to satisfy all constraints imposed by driving tasks while keeping the preferred driving position. Many experimental investigations have been performed on preferred postures. However, few studies were focused on the identification of the constraints, especially those related to vision. Rebiffé (1969) explained that the head orientation was highly constrained by the vision requirement. However, his analysis was based on the author's experience without experimental evidence. Reed et al. (2000) conducted an experimental study on the effects of seat height, fore-aft position of steering wheel, and cushion angle on driving posture. They concluded that drivers adapt to changes in the vehicle and seat geometry primarily through changes in limb posture, whereas torso posture remains fairly constant. However, head orientation was not investigated. We strongly hypothesize that the invariance in trunk orientation is due to the constant head orientation imposed by road vision for driving. The current study aims to test this hypothesis : Are the head and trunk orientations invariant in a natural driving position?