Tread of a tyre of a heavy-duty civil engineering type vehicle, intended to come into contact with the ground via a tread surface and made of at least one elastomeric material, the tread comprising raised blocks, extending from a bottom surface to the tread surface in a radial direction (ZZ') perpendicular to the tread surface, and separated from one another by cuts, each block being delimited by lateral faces that intersect the tread surface and by a contact face that forms part of the tread surface, each block having, in the radial direction (ZZ'), a radial height H and, in a circumferential direction (XX') tangential to the tread surface in a direction of rotation of the tyre, a mean circumferential length B, measured in its contact face, characterized in that at least one block comprises at least one incision opening onto its contact face and inside its lateral faces, in that each incision has, in the radial direction (ZZ'), a radial height H I, measured from the contact face, at least equal to 0.4 times and at most equal to 0.9 times the radial height H of the block, in that each incision opens onto the contact face along an open section having a closed perimeter L I at least equal to 1 times and at most equal to 3 times the mean circumferential length B of the block and a thickness E I at least equal to 0.08 times and at most equal to 0.2 times the radial height H I of the incision, in that each incision comprises a set of bridges, comprising at least one bridge, each bridge extending from the bottom surface of the incision, in the radial direction (ZZ'), over a radial height Hp at least equal to 0.3 times and at most equal to 1 times the radial height H I of the incision and having a length Lp, measured in a plane perpendicular to the radial direction (ZZ'), and in that the set of bridges has a cumulative length LC P, defined as being the sum of the lengths Lp of the bridges, at least equal to 0.1 times and at most equal to 0.4 times the closed perimeter L I of the open section of the incision. each block being delimited by lateral faces that intersect the tread surface and by a contact face that forms part of the tread surface, each block having, in the radial direction (ZZ'), a radial height H and, in a circumferential direction (XX') tangential to the tread surface in a direction of rotation of the tyre, a mean circumferential length B, measured in its contact face, characterized in that at least one block comprises at least one incision opening onto its contact face and inside its lateral faces, in that each incision has, in the radial direction (ZZ'), a radial height H I, measured from the contact face, at least equal to 0.4 times and at most equal to 0.9 times the radial height H of the block, in that each incision opens onto the contact face along an open section having a closed perimeter L I at least equal to 1 times and at most equal to 3 times the mean circumferential length B of the block and a thickness E I at least equal to 0.08 times and at most equal to 0.2 times the radial height H I of the incision, in that each incision comprises a set of bridges, comprising at least one bridge, each bridge extending from the bottom surface of the incision, in the radial direction (ZZ'), over a radial height Hp at least equal to 0.3 times and at most equal to 1 times the radial height H I of the incision and having a length Lp, measured in a plane perpendicular to the radial direction (ZZ'), and in that the set of bridges has a cumulative length LC P, defined as being the sum of the lengths Lp of the bridges, at least equal to 0.1 times and at most equal to 0.4 times the closed perimeter L I of the open section of the incision.