A heavy truck tire tread having a longitudinal direction, a lateral direction and a thickness direction, said tread comprising: - a tread edge limit; - a shoulder area extending in the lateral direction from the tread edge limit; wherein the shoulder area has an outer surface and a lateral sipe with an average sipe line at the outer surface oriented at an average sipe angle (αa) between a point A where the lateral sipe intersects an outer boundary line and a point B that is where the lateral sipe is farthest from point A in the longitudinal direction from 10% to 25% of a rolling tread width from the tread edge limit in the lateral direction, wherein the outer boundary line is a longitudinal straight line running at a distance of 8 mm from the tread edge limit, characterised in that the average sipe angle (αa) is greater than 20° in absolute value, wherein the average sipe angle (αa) is oriented at an angle relative to the lateral direction running inboard to outboard in the lateral direction, wherein the lateral sipe extends from the tread edge limit in the lateral direction past the outer boundary line and to the shoulder groove where the lateral sipe terminates; the lateral sipe has a sipe bottom, wherein the longitudinal direction lies in a reference plane, wherein a sipe bottom point is located in the reference plane at the sipe bottom, wherein a sipe top point is located in the reference plane at the average sipe line, wherein a sipe inclination line extends from the sipe bottom point to the sipe top point, wherein a reference line extends in the thickness direction through the sipe bottom point wherein the reference line does not have a component in the longitudinal direction or the lateral direction, wherein the sipe inclination line is at a sipe inclination angle to the reference line, wherein the sipe inclination angle is from 10 to 50 degrees, wherein the sipe bottom point is configured to approach a contact patch before the sipe top point upon forward motion. - a tread edge limit; - a shoulder area extending in the lateral direction from the tread edge limit; wherein the shoulder area has an outer surface and a lateral sipe with an average sipe line at the outer surface oriented at an average sipe angle (αa) between a point A where the lateral sipe intersects an outer boundary line and a point B that is where the lateral sipe is farthest from point A in the longitudinal direction from 10% to 25% of a rolling tread width from the tread edge limit in the lateral direction, wherein the outer boundary line is a longitudinal straight line running at a distance of 8 mm from the tread edge limit, characterised in that the average sipe angle (αa) is greater than 20° in absolute value, wherein the average sipe angle (αa) is oriented at an angle relative to the lateral direction running inboard to outboard in the lateral direction, wherein the lateral sipe extends from the tread edge limit in the lateral direction past the outer boundary line and to the shoulder groove where the lateral sipe terminates; the lateral sipe has a sipe bottom, wherein the longitudinal direction lies in a reference plane, wherein a sipe bottom point is located in the reference plane at the sipe bottom, wherein a sipe top point is located in the reference plane at the average sipe line, wherein a sipe inclination line extends from the sipe bottom point to the sipe top point, wherein a reference line extends in the thickness direction through the sipe bottom point wherein the reference line does not have a component in the longitudinal direction or the lateral direction, wherein the sipe inclination line is at a sipe inclination angle to the reference line, wherein the sipe inclination angle is from 10 to 50 degrees, wherein the sipe bottom point is configured to approach a contact patch before the sipe top point upon forward motion.