Previously, the driver himself would make the decision on whether to start the qualifying run. He would do so by raising his hand in the air as he approached the start/finish line. Due to the significantly rising speeds, and the awkwardness of doing so in the increasingly confined cockpits, this practice was abandoned. For instance, during qualifying in 1970, Lloyd Ruby raised his hand to make his attempt, but officials did not see it, and inadvertently waved him off. After he persuaded the officials for a do-over, he burned a piston. It was also in the interest of safety, reflecting upon an incident that involved Bobby Grim during the 1959 race. Grim suffered magneto failure and began coasting to the pits. As was customary for drivers of the time, he raised his arm to signify to the other drivers he had lost power. However, due to the high speed he was still traveling, he painfully dislocated his arm in the process.