The A14 in west Suffolk is edging closer to fully reopening after more than two weeks of flooding problems.
Over 12 million litres of water has been extracted from the eastbound carriageway near Newmarket, with National Highways on site 24 hours a day to clear the flooding.
National Highways confirmed on Thursday that lanes two and three have now reopened, with lane one still shut.
A 40mph speed limit restriction is in effect while works continue.
Following a closure enforced on Wednesday night, construction of the pipeline network has been completed, while minor leaks have been addressed.
A spokesman for National Highways said: "After addressing minor leaks, both the pumps and the pipeline network are functioning seamlessly as expected, actively engaged in the pumping process from the flood location to the outfall site.
READ MORE: Calls for investigation into flooding on A14
"While National Highways recognise challenges posed by the flooding, it condemns the unfair frustration expressed by drivers towards roadworkers."
Martin Fellows, regional director for the authority, said: “We apologise for the inconvenience caused to drivers and local communities. The team is making every effort to re-open all lanes as soon as possible. This flooding issue continues to be a regional priority, and we are seeking assistance from all parties.
“Our roads keep the country moving, keep families connected and businesses in business, so our roadworkers are vital to everyone’s wellbeing, and their wellbeing is vital to us.”
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