Light module of a motor vehicle comprising: - at least one first transverse row (12, 12A, 12B) of light sources; - at least one first one-piece primary optical element (18, 18A) which has at least one first forming layer (20, 20A, 20B) which comprises a transverse rear light input face (26, 26A, 26B) for the light that is common to all the light sources of the first row (12, 12A, 12B), an upper face and/or a lower face for guiding the light by total internal reflection towards a transverse front output face; - at least one bifocal imaging device (30, 30A, 30B) which is designed to project an image of each light source, the imaging device (30, 30A, 30B) having a first, transverse focusing plane which is arranged substantially coinciding with the light sources and a second, vertical focusing plane which is arranged substantially coinciding with the output face of the first forming layer (20, 20A, 20B); characterized in that the light module comprises at least one second transverse row (36, 36A, 36B) of light sources which is offset vertically relative to the first row (12, 12A, 12B), the first primary optical element (18, 18A, 18B) comprising at least one second one-piece forming layer (38, 38A, 38B) which is associated with said second row (36, 36A, 36B) and which comprises a transverse rear input face for the light, common to all the light sources of the second row (36, 36A, 36B), and arranged in the first, transverse focusing plane, an upper face and/or a lower face for guiding the light by total internal reflection towards a transverse front output face which is arranged in the second, vertical focusing plane. - at least one first transverse row (12, 12A, 12B) of light sources; - at least one first one-piece primary optical element (18, 18A) which has at least one first forming layer (20, 20A, 20B) which comprises a transverse rear light input face (26, 26A, 26B) for the light that is common to all the light sources of the first row (12, 12A, 12B), an upper face and/or a lower face for guiding the light by total internal reflection towards a transverse front output face; - at least one bifocal imaging device (30, 30A, 30B) which is designed to project an image of each light source, the imaging device (30, 30A, 30B) having a first, transverse focusing plane which is arranged substantially coinciding with the light sources and a second, vertical focusing plane which is arranged substantially coinciding with the output face of the first forming layer (20, 20A, 20B); characterized in that the light module comprises at least one second transverse row (36, 36A, 36B) of light sources which is offset vertically relative to the first row (12, 12A, 12B), the first primary optical element (18, 18A, 18B) comprising at least one second one-piece forming layer (38, 38A, 38B) which is associated with said second row (36, 36A, 36B) and which comprises a transverse rear input face for the light, common to all the light sources of the second row (36, 36A, 36B), and arranged in the first, transverse focusing plane, an upper face and/or a lower face for guiding the light by total internal reflection towards a transverse front output face which is arranged in the second, vertical focusing plane.