A driver broke his elbow during a crash at the Goodwood Revival event.
Martin Stretton smashed the bone in his arm after crashing his ISO Bizzarini A3C in the one hour Royal Automobile Club TT race.
Marshalls halted the action for around half an hour while he was given treatment.
He is now recovering at home.
Despite the crash organisers have hailed the retro event as one of the most successful in its ten year history.
Around 110,000 people visited the Revival during the three days, including a number of celebrity spectators and drivers.
A Goodwood spokesman said: "Fantastic racing and equally enthralling theatre on the infield made this, the tenth running of the event, the most appealing yet."
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