Performance-tuned vehicles, tight bends, breathtaking speed... racing is an inherently dangerous sport. Despite advances in driver protection and track improvements, driver and spectator deaths still occur. In May 2013 Japanese rider Yoshinari Matsushita was killed at the Isle of man TT and who can forget the horrific crash that claimed the life of Indy car veteran Dan Wheldon in 2011. DEADLIEST RACE TRACKSSome tracks will always be more dangerous than others. The guys at XCAR put together a video which they claim are the 10 most dangerous tracks in the world. Among the circuits featured are Monaco, Guia Circuit, Spa-Francorchamps, Daytona and the Nurburgring.What about Formula 1 legend Ayrton Senna and Roland Ratzenberger's tragic deaths in Imola, Italy?Xcar explains: "Obviously that fateful weekend, when we lost both Senna and Ratzenberger and Barrichello suffered his horrible crash, has Imola firmly planted in our memories as being dangerous. However, based on lives claimed over its lifetime, it didn't make the top 10."Watch the video!