• Bobby Unser won his second of three Indianapolis 500s in 1975, and is shown here with car owner Dan Gurney (R). He had started in the third spot from the front row in the Jorgensen Eagle/Offy. (Photo by ISC Archives/CQ-Roll Call Group via Getty Images)
  • Portrait of American racing driver Mark Donohue (1937 - 1975) as he poses with his car after winning the Indianapolis 500 (Indy 500) race, Speedway, Indiana, May 1972. (Photo by Authenticated News/Getty Images)
  • French-born American race car driver Gaston Chevrolet (1892 -1920) (right) and his mechanic John Bresnahan as they sit in their car on a race track, Elgin, Illinois, 1920. (Photo by Chicago History Museum/Getty Images)
  • Alexander Rossi_536862