Flexible pavements with bituminous surfacing are widely used in India. The high traffic intensity in terms of commercial vehicles, overloading of trucks, and significant variations in daily and seasonal pavement temperatures have been responsible for the early development of distresses such as rutting, cracking, bleeding, and potholing in bituminous surfaces. A major concern in India is the extreme pavement temperature conditions in certain regions. Under these conditions, bituminous surfaces tend to become soft in summer and brittle in winter. Studies have shown that the properties of bitumen and bituminous mixes can be improved or modified by incorporating certain additives or blends of additives. These additives are called "modifiers," and the bitumen premixed with these modifiers is known as "modified bitumen." The use of modified bitumen in the top layers of pavements is expected to significantly enhance the surface's lifespan and delay the need for renewal. Various studies have demonstrated that the use of modified bitumen in the construction and maintenance of bituminous roads significantly improves pavement performance and proves to be cost-effective when life-cycle costs are considered. These studies have experimented with different types and percentages of black additives, such as Carbon Black (CB), Furnace Black (FB), and Acetylene Black (AB), in proportions ranging from 1% to 5%.