bituminous compositions are provided by mixing 100 parts of an inorganic skeleton or an aggregate with up to 7 parts of bitumen with a first modifier chosen from the group comprising styrene - butadiene polymers , styrene - isoprene polymers , recycled tires or any mixtures thereof , and a second modifier selected from the group comprising polyolefins , polyethylene terephthalate or any mixtures thereof . the present composition allows the utilization of large amounts of recycled plastics .