Luminous signalling device (1) includes one or more light tubes (8) and focusing elements (2, 3, 4, 5, 6, 7) for focusing a light beam, these elements being capable of focusing a light beam coming from the light tube(s), the elements for focusing a light beam comprising several cylindrical lenses (2, 3, 4, 5, 6, 7), each cylindrical lens having a longitudinal axis lying parallel to a straight section (9, 10, 11) of the light tube. The straight sections (9, 10, 11) are oriented in several directions around a predetermined azimuthal axis (A), the number and the orientation of the straight sections being chosen so that the light beams coming from the straight sections and focused by the cylindrical lenses (2, 3, 4, 5, 6, 7) are directed in all azimuthal directions about the azimuthal axis.