A careful validation of the interaction of human drivers and operators with assistance systems or automated vehicles must ensure that all control actions and the exchange of information between humans and technology work smoothly and reliably in both directions. For this purpose, the use of driving simulators has proven to be effective and safe, particularly when safety-relevant functions are concerned. Moreover, the efficiency of such investigations can be better than real-world tests with a large number of test participants. To achieve the most realistic driving experience possible, dynamic driving simulators provide haptic feedback on forces and movements to the driver. Important components of such simulators, the basics for correct perception by the human driver, but also the fundamentals of test design with dynamic driving simulators as well as the requirements for a valid transfer of the results to reality are discussed in this chapter.