Saving fuel in lorries.

In the past, when motor fuel was relatively inexpensive, the aerodynamic drag of lorries was not seriously considered. This was despite the fact that aerodynamic drag accounts for as much power-loss as mechanical retardation in a typical tractor-trailer combination travelling at 90 km/h (56 mile/h). The high aerodynamic drag of lorry designs - basically box shapes - was merely overcome by more powerful engines leading to increased fuel crisis, there has been increased interest in recent years in reducing drag to save fuel. This article describes some of the important research findings.