Motorists have been warned to prepare for more delays in the coming weeks as further carriageway closures take place on the A14 at Kettering.
The Highways Agency, which is carrying out the widening work between Junctions 7 and 9, says the closures are needed to remove lights.
Some people living on the diversion route along London Road, Northfield Avenue and Barton Road where it joins up with the A43 northern bypass of Kettering, have expressed concern.
One London Road area resident, Andrew Potter, is concerned that large vehicles were forced to negotiate the narrow junctions of Kettering town centre.
He added: “You see this massive influx of HGVs at night.
“I came home at 9pm one night last week and the sheer level of traffic was horrendous. It was nose-to-tail and was really quite dangerous.
“Some of the corners are quite tight – you see lorries dragging their back ends around corners where people are walking.”
A Northamptonshire County Council spokesman said: “A14 closures were necessary to introduce a contraflow system.
“Keeping the diversion to A-class roads, a diversion was put in place through Kettering along Rothwell Road, Northfield Avenue, Northampton Road, Bowling Green Road, London Road and Barton Road.
“To mitigate the impact the closures were overnight between 8pm and 6am, or 8am at weekends.
“We also ensured that there was no full closure of the A14 – so traffic could use one direction.
“The closure was advertised on the A14 at Catthorpe Interchange from the west and Cambridge from the east.”
A Highways Agency spokesman said the diversion route was approved by the county council.
He added: “Weather permitting, there are five further closures planned in January, when the diversion will be in place, with a few closures in February.”
The A14 work is due to be completed in spring 2015.