The IndyCar Series is examining ways to make the cars safer . ` Dario Franchitti and three others taken to hospital following a crash in Houston . Four - time champion Franchitti had surgery on an ankle injury . Safety improvements have been made to IndyCar chassis since Dan Carpenter 's death in 2011 .
The IndyCar Series is examining ways to make the cars safer . Dario Franchitti and three others taken to hospital following a crash in Houston . Four - time champion Franchitti had surgery on an ankle injury . Safety improvements have been made to IndyCar chassis since Dan Carpenter 's death in 2011 .