Too fast is usually determined by the insurance underwriter who says whether or not they will cover a given event. Any racer still in his senses will not race at a track that does not have insurance, and insurance companies spend a lot of time looking at the safety of speedway and their potential of (financial) risk if a driver, fan or official is injured racing a given car at a given track.

Just because a car CAN go around a track does not always mean it SHOULD go around a track.
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