Rocks, birds and tyre scratches - all part of road hazards.
Simple ecplanation - when you drive around cones you stress your tyres more than street driving - often the tyre sidwall may make momentary contact with the road surface - this can happen even when making rapid transitions at 15 mph.
Let your dad know the maximum speeds reached yesterday were about 38mph - and that you were taking tunrs at abou 20mph.
Seems it may be time for us to get your father out and exposed the world a little - he may yet regret selling the Porsche afterall.
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