Aerodynamics of Road Vehicles: A Comprehensive Review

Aerodynamics plays a crucial role in determining how safe, fuel‑efficient, and fast road vehicles can be. As global demand grows for sustainable and energy‑efficient transportation, understanding the aerodynamic principles that govern vehicle performance has become increasingly important. This review examines fundamental aerodynamic concepts as applied to a range of road vehicles, including passenger cars, buses, and heavy trucks. Special attention is given to the interaction between vehicle shape, air movement, and the choice of structural materials. The paper discusses how factors such as drag, lift, pressure distribution, and surface roughness influence vehicle stability and energy consumption. It explores the performance impact of different body designs, from streamlined sports cars to box‑shaped trucks, and shows how modern design methods-such as computational fluid dynamics (CFD) and wind-tunnel testing-help engineers visualize and optimize airflow patterns. Particular emphasis is placed on the role of materials in shaping aerodynamic outcomes. Advanced alloys, lightweight composites, and new polymer blends not only reduce overall mass but also improve surface finish and structural rigidity. Case studies include the use of carbon‑fiber panels in sports vehicles, which minimize turbulence and cut weight, and the application of specialized surface coatings on commercial trucks, which reduce drag and improve fuel economy. Combined findings from experimental and simulated studies reveal that careful integration of materials and shape optimization can lower aerodynamic drag by 15–25%, translating into fuel savings of 5–12% under typical driving conditions. The review concludes with practical guidance for automotive engineers and designers, emphasizing that achieving aerodynamic efficiency is not limited to high‑performance vehicles. Rather, it is a key design goal for all modern road transport aiming to balance speed, safety, cost, and environmental responsibility.