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In page Ford GT40:
"In 1966 and early 1967, Ford's R&D department in Detroit developed a test rig to simulate circuit laps; the rig was programmed to accurately mimic the characteristics of the target circuit. The Mk IV design was revised based on weeks of simulated Le Mans laps. This was an early example of the now-common practice of using test rigs for Formula One and Le Mans vehicle protoyping.[citation needed]
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