After the tragic 1973 race, several changes were made to the course, as well as the car rules. The pit lane was widened, and lengthened to the north by about 400 feet. In addition, the inside wall from turn 4 to the pit entrance, which had played a part in the fatal 1973 crash that killed Swede Savage and the 1964 crash that killed Dave MacDonald and Eddie Sachs, was moved in, which allowed cars to have a much easier entrance into the pit lane as asphalt replaced grass in that area. The heights of the inside and outside retaining walls were also raised and set at a uniform height, a second safety fence was added to the existing fencing throughout, and several rows of trackside seats on the main straightaway were removed.