The treadmill system can be exchanged for serial and racing vehicles, a flow stabilizer and a side wind generator help reproduce the most realistic possible test conditions. This testing and measurement equipment enables us to better reach the goals of modern automobile construction, such as for example the reduction of CO2 emissions and of internal noise and also the increasing of costs efficiency by optimization of wind current resistance and of the development process. Thus the wind tunnel makes an important contribution to the readiness for the future of the automobile city Stuttgart.