A section of the A12 in Suffolk which is notorious for flooding is to undergo a £1.8m upgrade.
The section of road at Blythburgh was among a series of improvements set to cost £66m which were announced by the Department for Transport.
Waveney MP Bob Blizzard said the work was "vital" and he was "delighted" by the announcement.
He said: "At the moment the road often ends up under water during heavy rainfall or very high tides."
He added: "This work will protect Lowestoft's main link to the rest of the country."