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General Motors Proving Grounds

overview of the several proving grounds of General Motors

en-GB/ˈd͡ʒɛnɹəl ˈməʊtəz ˈpɹuːvɪŋ ˈɡɹaʊndz/
en-US/ˈd͡ʒɛnɹəl ˈmoʊtɚz ˈpɹuvɪŋ ˈɡɹaʊnz/

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road test track