Work is being carried out to reduce disruption while a mains gas line is replaced in Cornwall.
Cornwall Council said it had been working with Wales and West Utilities ahead of the major work in Penryn.
The Town Council and local traders have also been included in the joint working project.
New pipes will be installed at Lower Market Street, Saracen Place and Saracen Way. Work will begin on 4 January and take about 12 weeks.
More than 300m (984ft) of old metal gas pipes will be replaced with a new plastic alternative which has a lifespan of more than 80 years.
It will involve a technique known as "keyhole" insertion, where new plastic pipe is inserted into the old metal pipe system to help speed the process up.
For the safety of road users, pedestrians and the workforce involved in the project, some traffic management will be introduced.
Traders and residents have been warned to expect delays during the work, but the council said everything possible would be done to reduce disruption for what it described as essential work.
A retaining wall and footbridge in the area will also be repaired at the same time.