You're all wrong... the Isle of Man TT Races is by far the toughest and most dangerous race in the world.
If you don't have the slightest clue what the Isle of Man TT is then take a look here
http://autos.msn.com/advice/article....20201&src=News
For all the rest that have heard of it, I'd expect you to agree with me thats its the toughest of tough when it comes to racing. It gets held annually on the Isle of Man around a 37.73 mile road racing course. It's, sort of, one of those things that have to be witnessed first hand to realise the danger involved... imagine racing at an average speed of 120mph on roads too thin for two cars to pass through for 3 37.73 mile laps. I mean, these roads are not race track material in the slightest. They are roads maintained by the Isle of Man (an island measuring 21 miles x 9 miles) Government... really bumpy and stupidly twisty. Also, half the Manx population live beside the course so if you crash out, there isn't any specially designed crash barriers to soften your impact, just plain old concrete walls. On average, each TT claims about 10 riders and 5 pedestrians, quite alot for an Island with a population of 65,000.
I live on the Isle of Man so i've seen the in's and out's of the Manx TT, it's brilliant, however it takes the lives of many people, for eg. the 2004 TT started 4 days ago and already 5 people have been killed (2 racers, 3 others from general road accidents involving bikes). It also turns the roads over here into death traps for pedestrians. We hold a day called "Mad Sunday" in the middle of the TT fortnight. This is where you can flog the ass off your bike or car without the restriction of speed limits as long as you stick to the TT course.