A headlight of the elliptical type comprises an occulting or masking screen which defines a cut-off profile in the light beam emitted by a light source, the beam being a regulation lighting beam for use in wet weather, with a cut-off profile. This beam includes a zone of reduced illumination which is situated below the cut-off line. The occulting screen includes at least one generally transverse portion which is made of transparent material and which lies above the cut-off line. This transparent portion includes a zone of reduced transparency which forms the zone of reduced illumination within the regulation lighting beam.