Lighting device for a motor vehicle

A lighting device for a motor vehicle, the lighting device comprising:

• a flat waveguide with a length (L), width (Q) and depth (T), wherein the length (L) of the waveguide is greater than the width (Q), and the width (Q) is greater than the depth (T), wherein the waveguide has an entry surface and at least one light emission surface, wherein the length (L) of the waveguide is greater than 30 cm;
• a plurality of light sources, wherein at least some light generated by the light sources enters the waveguide through the entry surface, at least some of the light entering through the entry surface exits the at least one light emission surface, and at least part of the light exiting the at least one light emission surface exits the lighting device;
• and
• a device positioning and/or retaining the waveguide, wherein the device contains a receiver for a narrow surface of the waveguide extending along the length (L) of the waveguide.