FILE - In this May 27 2013, file photo, Dario Franchitti, of Scotland, celebrates in Victory Lane after winning IndyCar's Indianapolis 500 auto race at Indianapolis Motor Speedway in Indianapolis. The three-time Indianapolis 500 winner said Thursday, Nov. 14, 2013, that doctors have told him he can no longer race because of injuries sustained in an IndyCar crash last month. He fractured his spine, broke his right ankle and suffered a concussion in the Oct. 6 crash at Houston. (AP Photo/Darron Cummings, File)Three-time Indianapolis 500 winner Dario Franchitti reluctantly retired Thursday after medical doctors advised him it’s too dangerous to proceed racing following the accidents he suffered in a crash closing month.