Several factors influence classic asphalt modified series in bitumen modification systems. These include the type and percentage of polymer or additive used, the mixing temperature, and the shear rate during processing. Additionally, the compatibility of the modifier with the base asphalt, the aging characteristics, and the intended application (e.g., traffic load, climate conditions) also play crucial roles. Proper selection and optimization of these factors ensure enhanced performance and durability of the modified asphalt.