A light module for a motor vehicle comprising: a light guide with an input face and at least two branches each extending from the input face according to a specific length and a specific section; at least one light source arranged at the input face of the light guide, the input face being adapted to couple light rays emitted by the light source in the light guide; wherein the two branches are contiguous over a part of their length from the input face to a determined point of separation, the two sections of the branches overlapping over a zone of intersection which is present from the input face to the determined point of separation. The two sections are substantially constant along the branches from the input face over a length greater than or equal to the length of the branches between the input face and the determined point of separation.