I just wonder how it's enforced? Subjectively? Like what about some of the epic finishes of old where the two leaders spin each other out and go careening through the grass trioval frontstretch and across the line? Could the guy in second therefore not be allowed to pass during that wreck in the grass?

What about legitimately during other wrecks where some cars have had to go real low and even into the grass to get by safely and pass everyone?

I think this will be immensely difficult to write a rule for objectively and it will have to be left up to race officials to decide on individual occurrences.