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Multiple independent 50th-anniversary retrospectives (Torque[2], epilog.de, autohaus.de[3]) agree the Dudenhofen proving ground opened in April 1966, though none give an exact day.Opel opened its Dudenhofen proving ground near Frankfurt in April 1966, the most modern car test center in Europe at the time. Six decades on, its more than 70 kilometers of track still put prototype technologies like automated driving through secretive testing before they reach the road.
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