45, 540 - It is a dangerous sport, despite the ongoing efforts to make it safer. My Mum completely stopped watching it in 1994, after Ayrton Senna and Roland Ratzenberger died in crashes at the Imola circuit.
Modern cars are a lot sturdier - drivers can walk away unhurt from crashes that scare the *bleep* out of me watching on TV. It's amazing to watch the skill of the drivers racing and over-taking at those speeds, but you are always aware of the danger. Thankfully, serious injuries and fatalities are extremely rare now because of all the safety work. Since Imola, there's only been one