Drivers are being warned to expect delays in Preston as a £3.4m improvement scheme gets underway on Fishergate.
The next phase of the Fishergate Central Gateway project will start on Monday.
The aim is for a more pedestrian-friendly street which is less dominated by cars.
Work will start around the Lune Street area and will progress up to Mount Street finishing mid-November.
Soon after work begins the traffic lights will be removed from Lune Street and Chapel Street, which means Chapel Street will temporarily become one-way in the direction of Winckley Square to Fishergate. Traffic wishing to access Chapel Street from Fishergate will be diverted via Ringway, Manchester Road, Avenham Lane, Ribblesdale Place and Chapel Street.
The footpath on the east side of Lune Street between Fishergate and the car park entrance will also need to be closed between August and November, and pedestrian diversions will be put in place.
The work will see footpaths replaced with new granite flagstones and small set stones used for crossing areas.
New trees will be planted and modern street furniture and signage system pointing out key locations installed and footpaths will be widened with traffic reduced to one lane.
Phil Barrett, director of Lancashire Highway Services, said: “This project will completely transform Fishergate, resulting in a much more attractive environment, but some disruption is unavoidable while the work takes place so we’re asking people to be patient and bear with us. However, all business will be accessible throughout the works.”
The aims of the Fishergate Central Gateway project are to improve the key approaches to Preston city centre.