A vehicle warning device for outputting a vehicle warning signal to a first vehicle. The vehicle warning signal displays, prior to the entry of the first vehicle into a danger area, whether a second vehicle located ahead of the first vehicle is located directly behind this danger area, including a first communication interface configured to receive first data. The first data relate to a movement condition of the first vehicle. A second communication interface receives second data from the second vehicle. The second data relate to a movement condition of the second vehicle. A processing device determines, based on the first and second data, a future position of the second vehicle at a predicted time at which the first vehicle is located within the danger area. The processing device outputs, prior to the entry of the first vehicle into the danger area, the vehicle warning signal to the first vehicle if the determined future position of the second vehicle would cause the first vehicle to stop within this danger area.