Light-emitting module comprising: - a Fresnel lens, the Fresnel lens having an optical axis and comprising Fresnel prisms, each Fresnel prism having a first facet, called the main facet, and a second facet, called the draft facet, the draft facet making a draft angle (δ) to the optical axis, and - an element for positioning a light source, said element being intended to hold the light source in a given position (f) with respect to the lens, the light-emitting module being arranged so as to form, by means of at least the first facets of the Fresnel prisms of the lens, a light beam with a cutoff line separating a light zone of the beam from a dark zone, when a light source is placed in the given position (f), the first facets of the Fresnel prisms together forming the equivalent of a convergent dioptric interface having a focal point upstream of the lens, the light-emitting module comprising a shield that is arranged, with respect to the lens and to the position of the light source, to form the cutoff line, characterized in that for at least one of the Fresnel prisms, referred to as the variable-draft-angle Fresnel prism (e i), the draft angle (δ) is variable along this variable-draft-angle Fresnel prism, so that this draft angle is higher on a first side of the lens than on a second side of the lens that is substantially opposite said first side, and in that along the or at least one of the variable-draft-angle Fresnel prisms (ei) and from said second side to said first side, the corresponding Fresnel prism comprises at least one spreading segment (13', 14') located laterally with respect to a direction extending from the first side to the second side, and in this spreading segment the draft angle (δ) decreases then increases again, the spreading segments being arranged so that the rays deviated by the draft facets in these spreading segments are deviated toward the dark zone. - a Fresnel lens, the Fresnel lens having an optical axis and comprising Fresnel prisms, each Fresnel prism having a first facet, called the main facet, and a second facet, called the draft facet, the draft facet making a draft angle (δ) to the optical axis, and - an element for positioning a light source, said element being intended to hold the light source in a given position (f) with respect to the lens, the light-emitting module being arranged so as to form, by means of at least the first facets of the Fresnel prisms of the lens, a light beam with a cutoff line separating a light zone of the beam from a dark zone, when a light source is placed in the given position (f), the first facets of the Fresnel prisms together forming the equivalent of a convergent dioptric interface having a focal point upstream of the lens, the light-emitting module comprising a shield that is arranged, with respect to the lens and to the position of the light source, to form the cutoff line, characterized in that for at least one of the Fresnel prisms, referred to as the variable-draft-angle Fresnel prism (e i), the draft angle (δ) is variable along this variable-draft-angle Fresnel prism, so that this draft angle is higher on a first side of the lens than on a second side of the lens that is substantially opposite said first side, and in that along the or at least one of the variable-draft-angle Fresnel prisms (ei) and from said second side to said first side, the corresponding Fresnel prism comprises at least one spreading segment (13', 14') located laterally with respect to a direction extending from the first side to the second side, and in this spreading segment the draft angle (δ) decreases then increases again, the spreading segments being arranged so that the rays deviated by the draft facets in these spreading segments are deviated toward the dark zone.