Drivers are being warned to expect delays during a 13-week waterproofing project on a major road through Preston city centre.
The work will take place on the Ringway, the dual carriageway that runs through the centre of Preston, from Monday, May 11 until Saturday, August 8.
The project, run by Lancashire County Council, is to apply a protective waterproof layer to the underpass near the Market Street car park.
The work is intended to prevent the bridge from being damaged by water, and will involve the road surface being removed, the waterproof layer applied and the road surface reconstructed.
Ridwan Musa, Lancashire County Council highways manager for Preston, said: “We’re sorry for the disruption this work will cause, but it’s essential that we carry out maintenance to waterproof the underpass to preserve the bridge and prevent more inconvenience and cost in future.
“We’re planning to minimise inconvenience to people’s journeys as far as we possibly can by working overnight and at weekends, when traffic is lighter.
“We’ll be working 24-hours per day over these weekends as some aspects of the project mean that we need to work continuously and it will cause less disruption to do this work at the weekend.”
On weekdays, work will take place overnight from 8pm to 6am with lane restrictions in place.
On the weekends of Friday, May 29 to Monday, June 1, Friday, June 5 to Monday, June 8, and Friday, June 19, to Monday, June 22, highways teams will work continuously through the day and night.