of the line is no problem if there are several routes u2014 for example journey 1 high rise shuttle with one group and then after changeover travel downwards with a elevator of another group or journey 2 low rise shuttle with one group and after changeover travel upwards with a elevator of another group u2014 there is initially selected the most likely shortest route in terms of time to the destination on the basis of statistical values and the instantaneous travel situation after selection of the best line the extended journey is broken down into individual stretches or parts which can usually be served by different elevator groups if one of the part travels can be dealt with by any of several elevator groups a multi group control functions as for example according to patent ep 0 891 291 b1 in order to determine the first elevator to be used in the case of only one elevator group this multi group control determines the best elevator the first elevator to be used is thus evaluated and communicated on the terminal display to the passenger during the journey the central multi group control mgs tracks the course over time of the elevator travel with respect to arrival at the changeover floor as soon as the approach time to the changeover floor is fixed no more intermediate stops possible the evaluation of the best elevator of the next group for the second journey part begins as soon as the next best elevator is selected the passenger in the car can be informed the next.