Abstract: The device is designed for attaching on the rear parts of automotive vehicles and serves, especially during the night, for visual informing of drivers about the presence, the distance, the width and the length of a preceding vehicle. The device consists of light-reflecting elements, for instance, reflex foil, or of light-emitting elements, for instance, lamps. The said elements 1 arranged in two rows, one above the other, with the same spacing between the said elements, form a single module 4, and a pair of such modules arranged one above the other form a double warning-information module 5. The number of modules in a single strip /FIG. 1/ and in a double strip /FIG. 2/ depends on the width of the vehicle.