An MP has called for all sections of the A47 in Norfolk to become dual-carriageway after four deaths on the road since the beginning of the year.
George Freeman, MP for Mid Norfolk,said the road was becoming increasingly dangerous.
"In the seven years since I became an MP I have seen the A47 getting worse with volumes of traffic up and road standards down," he said.
"The A47 has been neglected for decades. Dualling is now urgent. It's hitting the economy; the road is dangerous, its junctions need upgrading. Now is the time for the roads alliance in the county to come together and lobby government for funding."
When major improvements on the A47 costing £300m were announced last year Highways England said: "Safety runs through everything we do. The number of people hurt on the A47 is reducing, but we are determined to do more to improve safety."