Steven Gardner, 38, from Dalkeith, Midlothian, lost control of the Mercedes on the A7 Edinburgh to Galashiels road on November 22 last year, hitting Steven Price's Ford Fiesta.
Mr Price pleaded with Gardner to help him, but he ran off and hailed another car, asking the driver to call 999.
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Hide AdAt Edinburgh Sheriff Court yesterday Gardner pleaded guilty to being over the limit, and driving without due care.
Sentence was deferred until December 6.