As a practical matter, the approval process for supplemental regulations (Executive Stewards and CRB ) will approve supps which supplement the GCR, but not override the GCR.
For example, an event's supps could specify a blend line at pit out, and penalties for crossing it. Or they could specify certain regional-only classes. These would be supplements to the GCR rules for that one event.
However, and also for example, supps which took away a competitor's right to protest would not pass the approval process since they override the GCR.
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