Safety work is under way to improve the drainage system on part of the A38 in Cornwall after "rain-related" crashes.
National Highways said the £1.3m drainage improvement scheme was taking place at Notter Bridge, near Saltash, to help stop further flooding on land near the River Lynher.
It said the area was identified as a "designated flooding hot spot, creating a significant hazard for road users".
Recent safety studies found a "significant percentage of rain-related collisions" in the area.
Historical flooding
Anna Gelderd, South East Cornwall MP, said the completion of works would greatly benefit residents, drivers and the environment.
"I'm more than aware of how much need there's been for drainage improvements here following historical flooding in the area," she said.
Ian Ellis, South West programme manager for National Highways, said the investment would "make a difference for both local communities and the thousands of people who use this route".
National Highways said the scheme was funded through its environment and wellbeing fund.
It said the work involved replacing existing drainage pipes and gullies, "significant" vegetation clearance and barrier renewal.
Waterproofing and resurfacing was being carried out under single lane closures on each side of the A38, it added.
It said the work, which started in September, was due to be completed in mid-December.
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