When I used to scrutineer tc cars we used to mark the wheels with permanent ink, say green for the first setof tyres and put a mark by the drivers name on a heat sheet. When the car came in after each race to be checked over if the wheels had no mark then we would dab them with another colour and mark the drivers name with 2 ticks to say he had used his allowance. If that car came in again with no mark then it would be disqualified.
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