Motorists are being warned of long delays on the A508 north of Northampton which have caused severe congestion at peak times during this week.
Drivers are being advised to avoid the route if possible or allow extra time for journeys while the works take place near the busy Boughton roundabout.
The junction is currently under round-the-clock four-way traffic signals as a utility contractor installs infrastructure into the new Buckton Fields development.
From now onwards the traffic lights will be manually operated until the work is due for completion late on Saturday 9 January. This will mean lights can be regulated to allow for changes in traffic flow from different directions throughout the day.
Cllr Michael Clarke, Northamptonshire County Council cabinet member for transport, highways and environment, said: 'We regret the severe delays motorists have been experiencing on the A508 while this work is taking place. If road users are able to stagger their journeys, or have an alternative route, we would advise them to do so until the work is completed at the end of this week (9 January).
'We have intervened with contractors to make sure that the traffic lights are manually controlled. That should ease the problem. We are also updating traffic information on our electronic signage to alert as many road users as possible of short term delays.'