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11 February 2014 Last updated at 12:37 GMT
The woman had been driving east towards Newmarket on the westbound carriageway before being stopped at junction 27.
She stopped in front of the police car with inches to spare.
Simon Newton reports.
An 81-year-old motorist driving the wrong way along the A14 at 50mph was stopped by police who put their car in the way of her vehicle.