In recent years, the asphalt industry has focused on improving pavement performance and durability while adopting more sustainable construction practices. Recycled plastic materials have become increasingly relevant for achieving these goals, as they can enhance material properties and reduce environmental impact. However, the direct use of recycled plastics in binder modification—especially those originally designed for hybrid or dry modification methods—is still not widely explored. This thesis investigates the fatigue and self-healing behaviour of bituminous binders modified with Recycled Low-Density Plastic (RLDP). Two modified binders containing 2% and 4% RLDP by total binder mass were tested, along with a neat 50/70 penetration grade binder used as a reference.