The present invention pertains to an indicating and/or lighting device 100 for a motor vehicle. The device 100 comprises a lighting module 102 having a main light source 104 and emitting a main light beam in a main direction. The device 100 comprises a front light guide 106 that is a flat light guide comprising two main surfaces 120 separated by edges 122. The front light guide 106 and its main surfaces 120 being arranged in front of the lighting module 102 and transversally to the main direction. At least one of the said main surfaces 120 comprises smooth surfaces portions 206 and irregular portions 208 covered by plurality of roughnesses with at least one pattern. Further, the device 100 comprises at least one side light guide 108 arranged at a side of the lighting module 102 including top and bottom. The side light guide 108 is arranged such that the light transmitted from the side light guide 108 is different from the light transmitted from the front light guide 106.