Backlit light assembly for a road vehicle and related road vehicle

1) Light assembly (16) for a road vehicle (1);

• the light assembly (16) comprising:
• a support structure (17) configured to be mounted on an outer body (4) of the road vehicle (1) and extending primarily along a first direction (A);
• an illuminating source unit (18), mounted on board the support structure (17) and comprising a plurality of luminous devices (19) arranged mainly along the first direction (A);
• and
• an at least partially transparent polymeric substrate (22) extending, along a second direction (B) perpendicular to the first direction (A), between a proximal end (23), mounted at the support structure (17) and the illuminating source unit (18), and a distal end (24), opposite the proximal end (23) and projecting from the support structure (17);
• wherein the polymeric substrate (22) comprises a thickness (W) lower than the other dimensions and is configured to be traversed, along its thickness (W), by a light beam (L) emitted from the luminous devices (19) at the proximal end (23), which exits at least from an outlet profile (25) arranged at the distal end (24);
• the light assembly (16) being characterised in that the polymeric substrate (22) comprises:
• two main outer surfaces (28) facing each other and a minor lateral surface (29) connecting the two main outer surfaces (28);
• wherein the outlet profile (25) is at least part of the minor lateral surface (29);
• and
• further outlet profiles (30) are made on at least one of the main outer surfaces (28), between the proximal end (23) and the distal end (24);
• wherein the further outlet profiles (30) are grooves (31), in particular millings that partially interrupt the passage of the light beam (L) towards the outlet profile (25) determining an intermediate partial exit thereof.