Air brakes â this effect is known to anyone who has ridden a bicycle into a headwind and had to pedal harder. The same applies to cars: given increased air resistance the motor has to work harder and fuel consumption increases. Consequently, aerodynamics is more and more at the centre of car design. The designers find role models in nature. The latest issue of VIAVISION shows you how the aerodynamics of the automobile are measured in wind tunnels and how they are improved.