The increasing global demand for sustainable and cost-effective road construction necessitates innovative approaches to flexible pavement design. This study investigates the enhancement of Dense Bituminous Macadam (DBM) through the incorporation of Reclaimed Asphalt Pavement (RAP), Styrene-Butadiene Rubber (SBR) latex, and Waste Engine Oil (WEO). RAP provides a sustainable alternative to virgin aggregates, reducing material depletion and construction costs, while SBR latex and WEO improve the mechanical properties and longevity of the asphalt mix. Laboratory experiments were conducted to evaluate the effects of varying RAP, SBR, and WEO proportions on DBM performance. Key performance indicators, including Marshall Stability, flow values, and durability assessments, demonstrated significant improvements in structural integrity, resistance to rutting, and overall pavement flexibility. The findings highlight the feasibility of incorporating recycled and modified materials in asphalt mixtures to enhance sustainability while maintaining or improving pavement performance. This study supports the adoption of environmentally responsible construction methodologies, contributing to resource conservation and cost-effective infrastructure development.