The National Grid have started work on the final stage of the gas mains upgrade in Horncastle.
As a result, North Street will be closed from the junction with High Street to the junction with Conging Street while the work takes place.
Traffic will be diverted via North Street, Louth Road, Stanhope Road and A158 East Street.
One this stage is finished work on the second section of North Street will be carried out under temporary traffic lights.
The work is due to be completed in early April.
National Grid Authorising Engineer Paul Patrick said: “We would like to thank the local community, especially traders and motorists, for bearing with us while we carry out this essential work and we would like to stress that Horncastle remains open for business.
“We are making every effort to finish this work as soon as possible, including drafting in additional staff. As we start in North Street, we would urge motorists to drive carefully on the diversion route and particularly along Stanhope Road, which is mainly residential.”
The work to renew gas mains in High Street, Market Place, St Lawrence Street and North Street, began on 10 February. The existing iron mains are being replaced with new hardwearing plastic pipes that are designed to last for at least 80 years.
National Grid will have to interrupt the gas supply to some properties for a short period. Engineers will liaise with customers beforehand to identify a convenient time to do this.
If anyone has any queries about the work and how it will affect them they can contact customer services on 0800 096 5678.