The pedestrian crossing on Newland (outside County Offices) in Lincoln is set to be refurbished.
Works are due to begin on Saturday 19 October and will see the current system replaced with new energy efficient equipment.
To allow the work to take place safely, from Saturday 19 October to Monday 28 October, Newland will be closed to westbound traffic at Orchard Street, with traffic diverted via the east/west link road and Brayford Bridge.
In addition, the eastbound side of Newland will be reduced to a single lane to protect the workforce and pedestrians whilst work is carried out in the footway.
The project is expected to be completed on Friday 1 November.
Anthony Gent, principal engineer – traffic signals, said: "The existing signal equipment is coming to the end of its life and it's important that we get it replaced to avoid it failing.
"One of the benefits of the new signals is that they are much more energy efficient, which will help reduce our carbon footprint.
"We've decide to begin the works during half-term to minimise the disruption as far as possible.
"We apologise for any inconvenience caused and would advise motorists to use alternative routes where they can."