The app calculates vehicle conditions and displays them graphically. With the help of the control, the steering angle and vehicle speed can be changed. The vehicle is displayed as a wire model and you can visually evaluate the movement variables of a truck with a drawbar trailer. The vehicle states are calculated in a 10 [ms] task with transfer functions for front axle, rear axle and drawbar trailer with position, angle and speed and second-order IIR filters.