An autonomous self-propelled mowing vehicle , comprising a frame fitted with: - a drive mechanism for driving the mowing vehicle in a direction of travel at a speed of travel during driving, - a mowing device for mowing plants situated on the land, - a bumper device , and - a control unit for the mowing vehicle which is operatively connected to the bumper device, wherein the bumper device comprises: - a first impact detector, and - a second impact detector, wherein the first impact detector (11, 11', 11") is depressible as a whole along a path with respect to the frame up to a stop on account of a force acting thereon, and is provided with a first switch which is connected to the control unit and is configured to emit a signal to the control unit if the impact detector is pushed in beyond a switching point, characterised in that the second impact detector (18, 19-1, 19-2) is deformable and locally depressible beyond a depressibility on account of a force acting thereon, and is provided with a second switch which is connected to the control unit and which emits a second signal to the control unit if the second impact detector is depressed at least beyond a predetermined depression threshold, wherein the control unit is configured: - to stop the drive mechanism upon receiving the second signal, and - to regulate the drive mechanism in such a way that the speed is reduced to a lower speed of travel upon receiving the first signal without receiving the second signal. - a drive mechanism for driving the mowing vehicle in a direction of travel at a speed of travel during driving, - a mowing device for mowing plants situated on the land, - a bumper device , and - a control unit for the mowing vehicle which is operatively connected to the bumper device, wherein the bumper device comprises: - a first impact detector, and - a second impact detector, - a first impact detector, and - a second impact detector, wherein the first impact detector (11, 11', 11") is depressible as a whole along a path with respect to the frame up to a stop on account of a force acting thereon, and is provided with a first switch which is connected to the control unit and is configured to emit a signal to the control unit if the impact detector is pushed in beyond a switching point, characterised in that the second impact detector (18, 19-1, 19-2) is deformable and locally depressible beyond a depressibility on account of a force acting thereon, and is provided with a second switch which is connected to the control unit and which emits a second signal to the control unit if the second impact detector is depressed at least beyond a predetermined depression threshold, wherein the control unit is configured: - to stop the drive mechanism upon receiving the second signal, and - to regulate the drive mechanism in such a way that the speed is reduced to a lower speed of travel upon receiving the first signal without receiving the second signal. - to stop the drive mechanism upon receiving the second signal, and - to regulate the drive mechanism in such a way that the speed is reduced to a lower speed of travel upon receiving the first signal without receiving the second signal. <EOS>