3. Citroën DS
Launched in 1955, the Citroën DS was a revolutionary vehicle that introduced hydropneumatic suspension, disc brakes, and an aerodynamic design. Despite its advanced features, the DS faced challenges in mass adoption due to its complexity and higher price point, which deterred many potential buyers. Nevertheless, it remains an iconic example of automotive engineering, influencing future vehicle designs and setting new standards in ride quality and handling. (hemmings.com)