Self-propelled construction machine witha chassis (1) with front wheels or drives in working direction (2, 3) and rear wheels or drives (4, 5);a machine frame (6) carried by the chassis,a drive device (9) to drive the front wheels or drives and/or the rear wheels or drives (2, 3; 4, 5);a steering device (10) for steering the front wheels or drives (2, 3) and the rear wheels or drives (4, 5); anda control unit (12),characterized by:the construction machine has a device (13) to assist the driver when driving backwards, with the device to assist the driver when driving backwards:a unit (17) to measure the position of the front wheels or drives (2, 3) and the rear wheels or drives (4, 5);a calculation unit (16) for determining data ((xo,yo), (x1,y1), (x2,y2), (x3,y3); M, r) describing at least one tractor (T1 to T6) of the construction machine depending on the position of the front wheels or drives (2, 3) and the rear wheels or drives (4, 5),an image recording unit (15) to record an image of the rear of the construction machine,a display unit (14) to display the recorded image of the rear of the construction machinery; andan image processing unit (18) so designed that the image of the rear of the construction machine shown on the display unit is overlaid with at least one trajectory (T1 to T6).
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