Network Rail says it is still on course to re-open the Pytchley Road bridge in Kettering next week.
Drivers have expressed relief that the work is about to end, which Network Rail says is reliant on there being no problems outside its control over the coming days, such as the weather.
The road, which has been shut since before Christmas so work could be carried out to electrify the Midland mainline, is due to be open to motorists again from Friday, February 28.
But traffic woes in the town will not be completely solved by the road’s re-opening, with widening work on the A14 set to continue until next year.
On the Northants Telegraph’s Facebook page, Lisa Jefferies-Wilkin said: “It was very poorly timed with the roadworks on the A14 making travel even more difficult.”
David Hall agreed that the two sets of roadworks taking place at the same time had magnified the problems, saying: “Sure the job in itself seems to have gone to plan, but to throw all the town traffic out on to a road that’s had its capacity halved has been ridiculous.”
A spokesman for Network Rail said: “Barring any issues outside our control, such as the weather and re-diverting of utility services, we are confident we will meet the February 28 programme date.
“We are working closely with our contractors and utility companies to monitor the progress. We are in the final stages of the project.”