Drivers are still being advised to find alternative routes as part of the A14 remains closed due to flooding.
More than eight million litres of water, which is almost enough to fill three Olympic-size swimming pools, have been removed from the eastbound carriageway near Newmarket since it first flooded more than two weeks ago.
Lanes one and two of the carriageway remain closed while National Highways continue to clear water from the road.
A spokesman for National Highways said: "The team is assessing potential damage to the carriageway caused by the flooding and the possibility of installing a contraflow to maintain smooth traffic flow.
"Excessively high ground water levels which are not naturally draining away, combined with the recent heavy rain, have contributed to a challenging situation.
"We are continuing our investigative work with The Environment Agency and others.
"We apologise for the inconvenience caused."
The disruption has prompted calls for an investigation from a local councillor.
Councillor Roger Dicker, who represents Kentford and Moulton at West Suffolk Council and also runs the Kentford village stores, said customers had spoken of the delays they have faced.
He said: "All I am getting from customers is what I am hearing is the traffic queues heading to that.
"It is just one thing after another. It just affects everyone in this area.
"There does need to be some investigation into why this is happening."
West Suffolk MP Matt Hancock described the situation as "completely unacceptable", and is calling for a better alternative route.
"The situation on the A14 is completely unacceptable and I understand the frustration felt by motorists, given the length of delays," he said.
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