Scania worked in collaboration with the world-famous Bertone design studio in Italy, using the most advanced computer-aided design systems, for creating the basic 4-series cab shape. Wind tunnel testing of several shapes and combinations of modular panels was used for refining aerodynamic performance so that fuel economy would be maximised.

Optimised space within minimised dimensions
The almost vertical windscreen is an unusual innovation. The benefit of an upright screen is more space.

Optimised aerodynamics within minimised dimensions
The low drag coefficient of the Scania cabs has been achieved by various innovations, most notably the relatively narrow front width and larger rear width. This smoothly profiled wedge has the effect of reducing the frontal area of the cab. The wedge shape also has the directs air around the cab when strong prevailing winds are meeting the cab at an angle – a condition far more common than directly head-on.

The aerodynamic efficiency has been further enhanced by large radius curves (rather than sharp angles) and strategically located air deflectors. The overall result is a cab capable of feeling rather than forcing its way through the air. The air is not merely deflected; its flow is actually managed all around the cab. This is highly effective at minimising air resistance at the front and reducing air turbulence at the sides, over the roof and under the floor.

The result is better fuel economy, especially for vehicles maintaining high cruising speeds over long distances.