Not a good week on the track.
Dan Wheldon was an inevitable tradgedy - that many cars on that size track was bound to end badly for someone. The governing body should never have allowed that situation to arise.
Marco Simoncelli was just terribly unlucky. The 2nd similar incident in MotoGP in the last year or so. I am an avid fan of MotoGP and Simoncelli came across as such a funny guy who I always hoped would make a name for himself at the highest level but too many crashes unfortunately caught up with him in the worst possible way.
These guys live on the edge by choice, and all know the risks, but that doesn't make it any less of a tradgedy when this sort of thing happens.
Rest In Peace.