( CNN ) -- The IndyCar Series is examining ways to make the sport safer after its four-time champion Dario Franchitti and several spectators were injured in a horror crash in Houston . The Scottish racer suffered concussion and two spinal fractures , and underwent surgery on his right ankle , following a final lap accident at the Grand Prix of Houston Sunday . An official and two spectators were also taken to hospital for evaluation following the incident . `` IndyCar is thoroughly reviewing the incident , '' said a statement on IndyCar.com . `` Reducing the risks that are associated with racing is one of our highest priorities and receives our constant and on going focus . `` Our thoughts remain with everyone affected by ( the ) accident . '' The crash in Houston came almost two years after British driver Dan Wheldon died during a multi car wreck at the Las Vegas Indy 300 . Just months before his fatal crash in 2011 , two-time Indianapolis 500 winner Wheldon had tested the prototype car chassis for the 2012 season . Following his death , the chassis , designed by Italian company Dallara , was christened the DW-12 in his honor . In May of last year , Dallara made further significant safety improvements to the chassis . These steps to improve safety may have helped Franchitti avoid serious injury . However , following the latest incident , IndyCar is once again reviewing safety for its drivers and fans .
The IndyCar Series is examining ways to make the sport safer . Dan Wheldon 's and Four spectators taken to hospital following a crash in Dallara . three -time champion Franchitti had surgery on an ankle injury . Safety improvements have been made to IndyCar chassis since Dan Wheldon 's death in 2011 .