People make mistakes, also in testing vehicles. Incorrectly interpreting the task, variations in repeated measurements or incorrect vehicle parameters are typical problems which often result from short test familiarization periods, fatigue or distraction. Automating testing, at least in part, can help to avoid such mistakes. For each task involved in testing, IAV prepares a detailed test plan and shows the testing person (e. g. sitting behind the steering wheel of a truck on the test track) on a display which test phase is currently in progress and which default values must be met. Because the display is easy to read, the person performing the test is not distracted but knows exactly what needs to be done at every single moment.