NASCAR races, though, are predomenatly on ovals. Fitness is less of an issue there.
And what happened in the 70's is not relevant now due to current safety rules. Regarding Clipal, IMO it's lunacy the current format and should be scrapped - stick the two legs together in to one 500km race, and make it two (or even three) driver.
Also, there's the problem of television coverage. Would a TV broadcaster really want to show a two to four hour race, given that motorsport is ALREADY poorly covered?
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