TRAFFIC signals are to be installed at the entry points to the Hellaby roundabout at Junction 1 of the M18, near Rotherham.
The £1.4 million Highways Agency project is to start on Monday, January 9.
Sections of the roundabout will also be widened to increase capacity and reduce queuing.
Resurfacing work is also planned, including adding high-friction surfacing on the roundabout approaches.
Drainage will also be improved and there will be some safety barrier renewal work.
The work is expected to take nine weeks to complete.
Tim Calvert, Highways Agency project sponsor, said: “This scheme will make the roundabout far more efficient and safer by regulating traffic flows, especially at peak times when traffic heading from the A631 can cause queues on the exit slip roads from the motorway.
“Every effort is being made to ensure any inconvenience to drivers and other roundabout users, as well as local residents, is minimised.”
Rotherham Council has contributed £80,000 towards the resurfacing costs.