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The principal development tool for the vehicle aerodynamicist continues be the full-scale wind tunnel In the absence of a reliable alternative it is expected that this will continue for many years As a true simulation of conditions on the road, the conventional full-scale wind tunnel has limitations In most cases the ground is fixed relative to the vehicle allowing an unrepresentative boundary layer to develop, the wheels of the test vehicle do not rotate and there is some uncertainty over the influences imposed by the tunnel walls These factors are known to influence measured aerodynamic data.