A £2.25million scheme of improvements along one of Truro's busiest routes is due to start next Friday, September 21.
Cornwall Council said the year of work on Trafalgar Roundabout, Tregolls Road and Morlaix Avenue will improve traffic flow and access for pedestrians and cyclists, upgrade the road surface, support public transport and re-route vital utility pipes.
The work will see a new pedestrian crossing built between the police station and the petrol station on Tregolls Road as well as a new right turn into Quay Street for buses travelling southbound on Morlaix Avenue.
Trafalgar Roundabout is one of the busiest junctions in Truro carrying an estimated 30,000 to 40,000 vehicles each day.
The work has been scheduled to take place mainly at night to avoid peak traffic periods and has also been planned to avoid key events including the City of Truro Carnival, Truro Half Marathon and the City of Lights parade, as well as late night Christmas shopping.
Sam Ward from CORMAC Solutions Ltd, which is carrying out the work alongside West Utilities and South West Water, said: "As this work is taking place on one of the busiest commuter routes in Truro we appreciate that motorists and local residents will be concerned about potential disruption. "The majority of the works will take place between 7pm and 6.30am and we realise that residents may have concerns about noise levels.
"We have however, programmed the work with road users and residents in mind and the work has been structured so that the noise levels are greatly reduced from 11pm. "We have talked to local residents about the scheme and during the works, members of the public are very welcome to visit our site office to talk about any concerns they might have."
South West Water will be replacing 298 metres of pipe, which the company's infrastructure delivery manager, Les Metcalfe, said will "help to deliver top quality drinking water to our customers in the area for years to come".
He added: "It will be necessary to turn off customers' water supply for short periods of time while we complete this work, but we will notify affected customers in advance."
Councillor Graeme Hicks, Cornwall Council portfolio holder for transportation and highways, said: "Not only are we improving the road network to cater for an increase in traffic, we are making the road safer for pedestrians and cyclists and supporting public transport."
For more information on the roadworks, including the time scales and frequently asked questions, visit www.cornwall.gov.uk/trafalgar.