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Three-time Indianapolis 500 winner Dario Franchitti reluctantly retired after doctors told him it is too dangerous to continue racing following the injuries he suffered in a crash last month. Franchitti fractured his spine, broke his right ankle and suffered a concussion in the Oct. 6 IndyCar race at Houston, where his car made contact with Takuma Sato’s car on the last lap and sailed into a fence. Debris from the accident injured 13 fans in the grandstands and one IndyCar official. The 40-year-old Franchitti underwent two surgeries on his ankle and recently returned home to Scotland to recover .