Four-point seat belt and relative road vehicle

A four-point seat belt (5) comprising:

• at least two thoracic branches (6) configured to anchor a chest (C) of a user (U) to a backrest (7) of a vehicular seat (4);
• at least two abdominal branches (8) configured to girdle and anchor the waist of the user (U) to the vehicular seat (4);
• at least one damping device (19) configured to be activated upon exceeding a first predetermined value (TS′) of a tension force (F) imparted by the user (U) to the belt (5);
• and
• a sacrificial seam (25) configured to maintain the thoracic branches (6) substantially with a planar configuration and to break or unravel upon reaching a second predetermined value (TS″) of the tension force (F), which is lower than the first predetermined value (TS′);
• wherein the at least one damping device (19) being configured to cause, upon its activation, a controlled advancement of the chest (C) of the user (U) while limiting the acceleration of the head of the user (U);
• wherein the at least one damping device (19) comprises one or more damping seams (21), the damping seams being configured to break or unravel upon the activation of said damping device (19);
• wherein the one or more damping seams (21) have a zigzag structure.