A roadway construction generally comprised of three layers, the first layer placed on grade being a sub-course of granular material or aggregate, the second layer, which is placed upon the first layer, being a base course, optionally a binder course located between the base course, and a wearing course and the wearing course that provides a smooth surface bound atop said base course, said base course comprising: 90 to 98% by weight of a bitumen component having a PEN value of from 20 dmm to 80 dmm according to ASTM Method D5 at 25° C.; and 2 to 10% by weight of a diblock copolymer composition comprising (i) a copolymer comprising one polymer block of a monovinyl aromatic hydrocarbon and one polymer block of a conjugated diene having a peak molecular weight from 30,000 to 78,000 and a vinyl content from 35 to 80 mol percent based upon the repeat monomer units of the conjugated diene block, and (ii) one or more block copolymers comprising two polymer blocks of monovinyl aromatic hydrocarbon and one polymer block of conjugated diene, the block copolymer selected from linear triblock copolymers having a peak molecular weight that is 1.5 to 3 times the peak molecular weight of the diblock copolymer, multiarm coupled block copolymers having a peak molecular weight that is 1.5 to 9.0 times the peak molecular weight of the diblock copolymer, and mixtures thereof, wherein each block copolymer has a vinyl content from 35 to 80 mol percent based on the number of repeat monomer units in the conjugated diene block, wherein the ratio of (i) to (ii) in the copolymer composition is present at a ratio of greater than 1:1, wherein the base course is in a paving application and has a PEN value in the range of 10 dmm to 100 dmm according to ASTM Method D5 at 25° C, and wherein the peak molecular weights are determined according to ASTM Method 3536, measured as polystyrene equivalent at the peak of the GPC. 90 to 98% by weight of a bitumen component having a PEN value of from 20 dmm to 80 dmm according to ASTM Method D5 at 25° C.; and 2 to 10% by weight of a diblock copolymer composition comprising (i) a copolymer comprising one polymer block of a monovinyl aromatic hydrocarbon and one polymer block of a conjugated diene having a peak molecular weight from 30,000 to 78,000 and a vinyl content from 35 to 80 mol percent based upon the repeat monomer units of the conjugated diene block, and (ii) one or more block copolymers comprising two polymer blocks of monovinyl aromatic hydrocarbon and one polymer block of conjugated diene, the block copolymer selected from linear triblock copolymers having a peak molecular weight that is 1.5 to 3 times the peak molecular weight of the diblock copolymer, multiarm coupled block copolymers having a peak molecular weight that is 1.5 to 9.0 times the peak molecular weight of the diblock copolymer, and mixtures thereof, wherein each block copolymer has a vinyl content from 35 to 80 mol percent based on the number of repeat monomer units in the conjugated diene block, wherein the ratio of (i) to (ii) in the copolymer composition is present at a ratio of greater than 1:1, wherein the base course is in a paving application and has a PEN value in the range of 10 dmm to 100 dmm according to ASTM Method D5 at 25° C, and wherein the peak molecular weights are determined according to ASTM Method 3536, measured as polystyrene equivalent at the peak of the GPC. (i) a copolymer comprising one polymer block of a monovinyl aromatic hydrocarbon and one polymer block of a conjugated diene having a peak molecular weight from 30,000 to 78,000 and a vinyl content from 35 to 80 mol percent based upon the repeat monomer units of the conjugated diene block, and (ii) one or more block copolymers comprising two polymer blocks of monovinyl aromatic hydrocarbon and one polymer block of conjugated diene, the block copolymer selected from linear triblock copolymers having a peak molecular weight that is 1.5 to 3 times the peak molecular weight of the diblock copolymer, multiarm coupled block copolymers having a peak molecular weight that is 1.5 to 9.0 times the peak molecular weight of the diblock copolymer, and mixtures thereof, wherein each block copolymer has a vinyl content from 35 to 80 mol percent based on the number of repeat monomer units in the conjugated diene block, wherein the ratio of (i) to (ii) in the copolymer composition is present at a ratio of greater than 1:1, wherein the base course is in a paving application and has a PEN value in the range of 10 dmm to 100 dmm according to ASTM Method D5 at 25° C, and wherein the peak molecular weights are determined according to ASTM Method 3536, measured as polystyrene equivalent at the peak of the GPC.