The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.
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.
A 50th-anniversary retrospective states the Dudenhofen proving ground opened in April 1966 as Europe's most modern auto test center.[1]
German trade press independently corroborates the April 1966 opening as part of Dudenhofen’s 50th anniversary coverage.[1]
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BMW
