Furthermore the angles for optimal comfort are considered in seat conception, i.e. average values of the posture angles in the car that are subjectively perceived as pleasant by humans, figure above.
The driver's place and thus the interior design depends on the seating position of passengers in the vehicle and these are best described with the help of the fixed reference points of the body and that of the vehicle.
The H-point (or the hip point) is defined as the body-fixed reference point. The H-point is defined as the theoretical point of intersection between the axis of rotation of the torso about the thigh line and the plane of symmetry of the body.