Tyre for a heavy vehicle of construction plant type, comprising: - a tread having a radial thickness H T at least equal to 60 mm and an axial width W T , - the tread comprising cuts having a width W D and a radial depth H D , and elements in relief that are separated from one another by the cuts , - the cuts , the width W D of which is at most equal to 20% of their radial depth H D and the radial depth H D of which is at least equal to 50% of the radial thickness H T of the tread , referred to as effective cuts, having a cumulative length L D measured on a radially outer surface of the tread , - the effective cuts being groove type cuts, allowing air circulation in the tread, and not incisions, - the tread having a degree of surface siping TL, expressed in m/m 2 , equal to the ratio between the cumulative length L D of the effective cuts and the area A of the radially outer surface of the tread equal to 2ΠR E ∗ W T , where R E is the external radius of the tyre, - the tread comprising, at least at the bottoms of the cuts , an elastomeric compound having a crack resistance defined by a number of cycles to failure N R , and measured according to the protocol described in standards ASTM D4482-85 and ISO 6943, characterized in that the degree of surface siping TL of the tread is at least equal to 3 m/m 2 , in that the number of cycles to failure N R of the elastomeric compound of the tread is at least equal to 60000 cycles and in that the ratio C between the number of cycles to failure N R of the elastomeric compound of the tread and the degree of surface siping TL of the tread is at least equal to 20000 cycles/(m/m 2 ). - a tread having a radial thickness H T at least equal to 60 mm and an axial width W T , - the tread comprising cuts having a width W D and a radial depth H D , and elements in relief that are separated from one another by the cuts , - the cuts , the width W D of which is at most equal to 20% of their radial depth H D and the radial depth H D of which is at least equal to 50% of the radial thickness H T of the tread , referred to as effective cuts, having a cumulative length L D measured on a radially outer surface of the tread , - the effective cuts being groove type cuts, allowing air circulation in the tread, and not incisions, - the tread having a degree of surface siping TL, expressed in m/m 2 , equal to the ratio between the cumulative length L D of the effective cuts and the area A of the radially outer surface of the tread equal to 2ΠR E ∗ W T , where R E is the external radius of the tyre, - the tread comprising, at least at the bottoms of the cuts , an elastomeric compound having a crack resistance defined by a number of cycles to failure N R , and measured according to the protocol described in standards ASTM D4482-85 and ISO 6943, characterized in that the degree of surface siping TL of the tread is at least equal to 3 m/m 2 , in that the number of cycles to failure N R of the elastomeric compound of the tread is at least equal to 60000 cycles and in that the ratio C between the number of cycles to failure N R of the elastomeric compound of the tread and the degree of surface siping TL of the tread is at least equal to 20000 cycles/(m/m 2 ). <EOS>