Tire for a heavy duty vehicle with improved grip

A tire for a heavy-duty vehicle comprising a tread, intended to come into contact with the ground via a tread surface, comprising a median portion and two lateral portions,

• the median portion being separated from each lateral portion by a circumferential cut forming, with a circumferential direction (XX′) of the tire, a mean angle less than 45°,
• the median portion comprising at least one complex circumferential cut, forming, with the circumferential direction (XX′) of the tire, a mean angle less than 45°,
• the at least one complex circumferential cut comprising, when the tire is new, an alternation of external cavities, opening onto the tread surface, and of internal cavities, that are hidden inside the tread and connected to the tread surface by a circumferential sipe, two consecutive cavities, respectively an external cavity and an internal cavity being connected to one another,
• the median portion comprising a plurality of transverse cuts, having at least one transverse portion forming, with the circumferential direction (XX′) of the tire, a mean angle (T, B1) at least equal to 45°,
• the tread having a maximum depth-of-cut (H),
• wherein the plurality of transverse cuts comprises a first family of transverse cuts, referred to as transverse through-sipes, that intersect at least one complex circumferential cut between two consecutive external cavities and that each have a thickness (E1) at most equal to 0.8 mm and a depth (P1) at least equal to 20% of the maximum depth-of-cut (H), each transverse through-sipe being at a distance (D1), from the nearest external cavity of said complex circumferential cut, at least equal to 7 mm, and wherein the plurality of transverse cuts comprises a second family of transverse cuts, referred to as blind transverse cuts, that each have a thickness (E2) at least equal to 1 mm and a depth (P2) at most equal to 20% of the maximum depth-of-cut (H), each blind transverse cut stopping at a distance (D2), from said external cavity, at least equal to 3 mm.