Copeland MP Jamie Reed has written to Chancellor George Osborne ahead of tomorrow's Budget, to call for urgent road investment in Cumbria.
Mr Reed says the A595 "requires significant improvements" to cope with additional traffic from the planned new nuclear power station at Moorside.
The road is the longest in Cumbria, and at certain times the busiest.
Cumbria County Council say they are carrying out a feasibility study, into how the A595 road can be improved.
Two women died after an accident on the road on Tuesday 23 February.
Carlisle's Conservative MP John Stevenson has called on the council to make a serious case to central government, to improve the road.
Two women who died in a crash on the A595 at Newby Cross have been named by police.
Hayley Sarah Murdoch, 29, from Carlisle, and Sheila Dixon, 71, from Carlisle, were pronounced dead at the scene.
Both were passengers in a Kia Picanto, which was involved in a two vehicle collision near Sowerby Wood at around 3:20pm on Tuesday 23 February.
The driver of the Kia, a 74-year-old man from Carlisle, remains in a critical but stable condition.
A three-year-old boy from Carlisle was also in the vehicle and he remains poorly but stable.
Both are at the Royal Victoria Infirmary in Newcastle.
The driver of a Ford Transit van, a 51-year-old man from Aspatria, was taken to Carlisle Infirmary with minor injuries.
There have been calls to improve the A595, after an accident in which two women were killed.
Carlisle MP John Stevenson says the county council should conduct feasibility studies to see how the road could be improved.
You've been telling us what you think about the road:
There are renewed calls to upgrade the A595 in Cumbria.
Carlisle MP John Stevenson says Highways England, Cumbria County Council and the Local Enterprise Partnership need to work together.
Two women died in a crash on the A595 on the outskirts of Carlisle, on Tuesday.
The A595 between Cockermouth Papcastle roundabout and Carlisle Thursby roundabout is closed. The major commuting route has been closed due to heavy rainfall to allow the highways agency to resolve the issue.
Cumbria Police have asked for motorists and pedestrians to avoid the area and use alternative routes cautiously due to small floods and heavy traffic on minor roads throughout West Cumbria.
Wigton Road into Carlisle should be open very soon, as a livestock trailer that overturned has been recovered:
The A595 has been partially blocked after an accident involving a trailer carrying sheep and livestock.
Sheep are on the road, causing delays both ways between A689 / Peter Lane and Wigton Road / Queensway.
Police are directing traffic.