I think back in the 80's they had a very similar accident at a NASCAR Event where a car went airborne or a Tire came off and landed in the stands and people were killed. Then they put up a fence that keeps debris from flying into the stands.
Do you mean this wreck?
No one died in it, although many of the sports announcers and people involved in NASCAR admit if anyone did die, it would have severly hampered the series.