The refurbishment at the toucan crossing near Spain Lane was due to begin on May 16 and be completed by June 24.
However, owing to a delay with others works, it is now due to run between May 24 and July 7.
The upgrade is taking place as the current signalling equipment is reaching the end of its operational life, Lincolnshire County Council says. During the project, there will be lane closures and a temporary speed limit of 30mph to keep road users and site workers safe.
Coun Richard Davies, executive member for highways, said: “Inevitably, these works will cause some minor disruption whilst the changes are made. But in the end the crossing will be improved by the work that is being done.”
The work will consist of replacing all traffic signal equipment. The pedestrian element of the crossing will change from far-side to nearside indicators with on-crossing and kerbside detection. The tactile paving, duct chambers/lids will also be replaced where required.
The new signal equipment will be extra low voltage, which will reduce the carbon footprint of the crossing. It will also provide a safer working environment due to the lower voltage, the council says.