Apart from function and the frequency of operation, one can differentiate the hand control elements as those that are used for operation in standstill and for operation while driving. Thus four priority groups can be defined in detail:
Important elements that are used while driving and are arranged in such a way that hands are as far as possible not withdrawn from the steering wheel (e.g. indicator switch).
Important elements, which are used with lesser frequency, but arranged within the favourable range in the proximity of the steering wheel (hands may be withdrawn from the steering wheel), e.g. headlight on/off.
Less significant or less frequently operated elements, which should also be accessible, but are of lower importance for driving the vehicle, e.g. elements that influence comfort.
Elements, which are used particularly during standstill and whose operation requires a prolonged deviation of view from the road, e.g. seat adjustment.
When dealing with the actuating forces, attention must be paid to limiting values so that too much is not demanded of the driver. The driver's arm has a higher traction power compared to the thrust force, i.e. the movement towards the body can be better performed than those away from the body.
For the range of operation of the foot, the position of the leg is determined, to a large extent, by the seat. Since the actuation of the sectors that are operated by foot require the expenditure of some energy, this has also to be considered during the arrangement.