Radio communications between race cars and pit crews at Sebring were not common until the 1970s. Before that, pit boards were the standard method of communicating with drivers, as this photo illustrates … Note the haybale for protection …

Radio communications between race cars and pit crews at Sebring were not common until the 1970s. Before that, pit boards were the standard method of communicating with drivers, as this photo illustrates … Note the haybale for protection …

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