Emergency services were called to the A27 by the junction with the A22 near Polegate last night (Thursday) after a car left the road and collided with a tree.
The accident happened at 7pm and there were major tailbacks in both directions.
No other vehicles were involved.
Sussex Police said this lunchtime that a 73-year-old man from Waldron failed a roadside breath test before being taken to hospital as a precaution.
He will be reported to summons later.
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