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 (XY) 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 (XY) 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 . <EOS>