Lighting device of a motor vehicle, comprising - a first light guide for propagating light by means of total reflection along a longitudinal extension of the first light guide, the longitudinal extension being many times greater than a transverse extension of the first light guide, the first light guide having a first light entry surface which is arranged on at least one end face of the first light guide, wherein at least one light source is arranged in front of the light entry surface, and wherein the first light guide has a light outcoupling surface extending over a region of the longitudinal extent, which directs light incident thereon to a light exit surface of the first light guide substantially opposite the light outcoupling surface, and - at least one second light guide for propagating light by means of total reflection along a longitudinal extension of the at least one second light guide, the at least one second light guide having a light entry surface which is arranged at at least one end face of the second light guide, and at least one light source being arranged in front of which light entry surface, and wherein the second light guide has a light exit surface via which at least part of the light emerges from the at least one second light guide, wherein the at least one second light guide is arranged with respect to the first light guide in such a way that light from the second light guide enters the first light guide via a central coupling, wherein a central coupling is a coupling in of light, which does not take place via end faces of the light guide, wherein decoupling elements are arranged on the light exit surface of the second light guide and wherein the light emerging from the at least one second light guide enters the first light guide via the light outcoupling surface of the first light guide, wherein an air gap is formed between the light exit surface of the at least one second light guide and the light outcoupling face of the first light guide, and wherein the light outcoupling surface of the first light guide has a prism structure, characterised in that the light output surface of the at least one second light guide has a prism structure which is formed complementary to the prism structure of the light outcoupling surface of the first light guide. - a first light guide for propagating light by means of total reflection along a longitudinal extension of the first light guide, the longitudinal extension being many times greater than a transverse extension of the first light guide, the first light guide having a first light entry surface which is arranged on at least one end face of the first light guide, wherein at least one light source is arranged in front of the light entry surface, and wherein the first light guide has a light outcoupling surface extending over a region of the longitudinal extent, which directs light incident thereon to a light exit surface of the first light guide substantially opposite the light outcoupling surface, and - at least one second light guide for propagating light by means of total reflection along a longitudinal extension of the at least one second light guide, the at least one second light guide having a light entry surface which is arranged at at least one end face of the second light guide, and at least one light source being arranged in front of which light entry surface, and wherein the second light guide has a light exit surface via which at least part of the light emerges from the at least one second light guide, wherein the at least one second light guide is arranged with respect to the first light guide in such a way that light from the second light guide enters the first light guide via a central coupling, wherein a central coupling is a coupling in of light, which does not take place via end faces of the light guide, wherein decoupling elements are arranged on the light exit surface of the second light guide and wherein the light emerging from the at least one second light guide enters the first light guide via the light outcoupling surface of the first light guide, wherein an air gap is formed between the light exit surface of the at least one second light guide and the light outcoupling face of the first light guide, and wherein the light outcoupling surface of the first light guide has a prism structure, characterised in that the light output surface of the at least one second light guide has a prism structure which is formed complementary to the prism structure of the light outcoupling surface of the first light guide.