He followed the tradition of launching the Indianapolis 500 with the command, "Gentlemen, start your engines!" Into the 1970s, despite the fact he'd given the command so many times before, he would always practice it extensively beforehand, and on race day, he would invariably pull a card containing the famous words: "Gentlemen, start your engines!" from the pocket of his suit as he stepped to the microphone. Luke Walton, who with Wilbur Shaw had founded the Indianapolis Motor Speedway Radio Network, was for many years a sportscaster and worked annually with Hulman (and later with Mrs. Hulman) to ensure each word was delivered with the proper emphasis.