Lighting unit for vehicles having a light emitting light source and having an optic unit assigned to the light source, by means of which the light emitted by the light source is deflectable in the direction of a main radiation direction and against it, wherein - the optic unit has a mirror device (1, 24, 34) comprising a front mirror (9, 25, 35) and a mirror (10, 26, 36) arranged in the main radiation direction behind the same, between which the light is reflectable backward and forward, the front mirror (9, 25, 35) being embodied in a partially transmitting manner, so that a first part of the light beam (L1', L1", L2, L2', L2",L3) hitting the front mirror (9, 25, 35) in the main radiation direction passes through it and a second part of the light beam (L1', L1", L2, L2', L2",L3) hitting the front mirror (9, 25, 35) is reflected in the direction of the rear mirror (10, 26, 36), - the light source is positioned in a border area of the mirror device (1, 24, 34), - a light beam (L1', L1", L2, L2', L2", L3) radiated by the light source enters an intermediate space situated between the front mirror (9, 25, 35) and the rear mirror (10, 26, 36), characterized in that - the distance between the front mirror and the rear mirror is chosen and/or the light beam (L1', L1", L2, L2', L2", L3) laterally entering the mirror device is directed in a manner so that the first part of the light beam (L1', L1", L2, L2', L2", L3) forms spaced apart light spots and / or light lines (15, 15', 15") on points of passage of the front mirror (9, 25, 35), and - the light source radiates a further light beam with a higher luminous flux, when compared to the light beam (L1', L1", L2, L2', L2", L3) coupled into the intermediate space, in the main radiation direction for the generation of a signal light function. - the optic unit has a mirror device (1, 24, 34) comprising a front mirror (9, 25, 35) and a mirror (10, 26, 36) arranged in the main radiation direction behind the same, between which the light is reflectable backward and forward, the front mirror (9, 25, 35) being embodied in a partially transmitting manner, so that a first part of the light beam (L1', L1", L2, L2', L2",L3) hitting the front mirror (9, 25, 35) in the main radiation direction passes through it and a second part of the light beam (L1', L1", L2, L2', L2",L3) hitting the front mirror (9, 25, 35) is reflected in the direction of the rear mirror (10, 26, 36), - the light source is positioned in a border area of the mirror device (1, 24, 34), - a light beam (L1', L1", L2, L2', L2", L3) radiated by the light source enters an intermediate space situated between the front mirror (9, 25, 35) and the rear mirror (10, 26, 36), - the distance between the front mirror and the rear mirror is chosen and/or the light beam (L1', L1", L2, L2', L2", L3) laterally entering the mirror device is directed in a manner so that the first part of the light beam (L1', L1", L2, L2', L2", L3) forms spaced apart light spots and / or light lines (15, 15', 15") on points of passage of the front mirror (9, 25, 35), and - the light source radiates a further light beam with a higher luminous flux, when compared to the light beam (L1', L1", L2, L2', L2", L3) coupled into the intermediate space, in the main radiation direction for the generation of a signal light function.