After ca. 80 km from Stuttgart on the A81 towards Singen, take the Horb am Neckar exit. In Horb, take a right over the Neckar bridge towards Herrenbart, Freudenstadt; follow the B14, pass through the city and the other side of the valley, and continue on until the first traffic light. Take a left there towards Freudenstadt, Obertalheim, Horb Hohenberg. At the traffic circle, continue towards Freudenstadt until the junction of the industrial area of Heiligenfeld. Turn left there and note the SP sign at the beginning of the industrial park next to a concrete mixing plant.