Whiston crossroads is one of the most congested in the town, and carries traffic bound for the M1 and M18 motorways and the nearby Rotherham District Hospital.
A scheme to cut jams and widen the road began in early 2007 and was supposed to take a year to complete but it overran by six months leading to criticism of the council.
Now highways bosses are being forced to close parts of the new A631 road, between the Rotherway roundabout and the crossroads for more safety work and "minor repairs".
The work will include the installation of additional pedestrian signs and guard rails, additional bollards to indicate cycleways, and new drainage on the Rotherway roundabout.
The maintenance scheme also includes grass cutting, gully cleaning, road markings and some repointing of a retaining wall.
A council spokesman said: "The works are being carried out together to ensure minimum disruption to road users and taking advantage of the August holiday period when traffic flows are at their lowest.
"There will be no road closures during the works, which are due to be completed by Friday, August 27, but some traffic movements will be restricted."
The council said most restrictions will be on Sundays only including lane closures on West Bawtry Road.
The spokesman added: "Diversion routes will be clearly signed, and although drivers using them will obviously experience delays. Rotherham Council anticipates that generally, delays will be small.
"Access to all residential properties in the area will be maintained at all times throughout the works."