Aldenhoven Testing Center is a modern, interdisciplinary testing center for mobility. Twelve track elements allow simulating almost every situation from real traffic. In order to research, develop and validate automotive systems and functions, it is essential that they first be used on a closed test site. Only when they have proved their maturity there can they be used in public road traffic. The customers of the Aldenhoven Testing Center can use a 2 km oval with banked curves, a vehicle dynamics area with a diameter of 210 m, a hill section with gradients of up to 30 % and a four-lane highway element, among other things, for their tests. Since 2018, an urban environment completes the possibilities to simulate almost all traffic situations. This provides ideal conditions for automated driving. With coverage by a simulated signal from the European satellite navigation system Galileo, the topic of digitization of traffic has played a major role since the company was founded. Thanks to coverage by the most modern mobile radio test field in Europe, the 5G Mobility Lab, and other radio standards, the networking of vehicles in traffic (V2X) can be comprehensively demonstrated. Aldenhoven Testing Center is a joint venture of the district of Düren and RWTH Aachen University, which is open to all interested companies, especially SMEs and start-ups. Since 2009, the former Emil Mayrisch coal mine site in Aldenhoven has been successively developed and expanded. Customers include vehicle manufacturers and suppliers, research and development service providers, as well as universities and research institutes. It is also a popular location for corporate events.