Are you serious? The difference is 200mph and a fine line between life and death. If you don't value life enough to even consider making it safer than we don't have a discussion.
If you value life over risk you dont race that race... not amount of fences will make it safe as its just too tight between stone fences and buildings etc
there are many other safer places to race if you want less risk, that race is what it is as far as I am concerned
There are many things in this world that people do that are outside my comfort zone but its up to each person on weather they take the risk