This thesis has been developed within the framework of the PRIN SWITCH project. The initiative addresses one of the most pressing challenges of modern society: the increasing production of non-biodegradable plastics and their inadequate disposal, which often leads to significant environmental concerns. The road infrastructure sector, especially road engineering, emerges as a promising area for exploring new applications, all while keeping sustainability at the forefront. This research focuses on the characterization and modification of standard bitumen by incorporating recycled polymers to enhance binder performance. The mixtures were assessed using both traditional empirical classification and performance-based methods to evaluate how they behave under various conditions.