Former Olympic 100m champion Linford Christie crashed head on into a taxi with two newly-weds inside while driving the wrong way up the A413 in Buckinghamshire, a court has heard.
The 51-year-old former athlete, from Twickenham, denies dangerous driving in Chalfont St Peter on 8 May last year.
Mr Christie clambered from his badly-damaged Audi A8 after the collision, Aylesbury Crown Court heard.
Soon after he said: "Oh my God, it's all my fault", the jury was told.
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