In 1973 the entrance into the dangerous and bumpy Kallenhard corner was made slower by adding another left-hand corner after the fast Metzgesfeld sweeping corner. Safety was improved again later on by removing the jumps on the long main straight and widening it, and taking away the bushes right next to the track at the main straight, which had made that section of the Nürburgring dangerously narrow. A second series of three more F1 races was held until 1976. However, primarily due to its length of over , and the lack of space due to its situation on the sides of the mountains, increasing demands by the F1 drivers and the FIA's CSI commission were too expensive or impossible to meet. For instance, by the 1970s the German Grand Prix required five times the marshals and medical staff as a typical F1 race, something the German organizers were unwilling to provide. Additionally, even with the 1971 modifications it was still possible for cars to become airborne off the track. The Nürburgring was also unsuitable for the burgeoning television market; its vast expanse made it almost impossible to effectively cover a race there. As a result, early in the season it was decided that the 1976 race would be the last to be held on the old circuit.