TRANSPORT contractors have promised Truro's bid to impress judges in the South West and Britain In Bloom competitions will not be disturbed by works on Trafalgar Roundabout.
Surveying on the city-centre roundabout started on Monday in preparation for improvements due to take place later this year.
If the three-week programme overruns, however, it could threaten the city's chances in the regional and national competitions.
The city was chosen to represent the region category after winning the Portman Cup in last year's South West In Bloom competition.
Sam Ward from contractor Cormac Solutions said: "We're aware of the upcoming competition and have been in close liaison with Richard Budge of Truro City Council's parks department to ensure that on completion of these works the island is reinstated to his satisfaction."
Mr Budge said: "We understand the works are necessary and are working with the council and Cormac Solutions to achieve a result that satisfies everyone.
"With the South West In Bloom and Britain In Bloom competitions around the corner in July, we will be making sure the roundabout is restored and looking good once again after the works have been completed."
The surveys, taking place between 7am and 5.30pm, will record the location and depth of communications ducts, water mains and gas pipes beneath the roundabout before work takes place in the autumn.
Tim Wood, Cornwall Council's assistant head of transport, said: "We expect the main Trafalgar Roundabout works, which will take around six months to complete, to begin in September or October.
"The works will reduce the width of the central island to widen traffic lanes and improve traffic flow.
"With new 24-hour signal control we will introduce a pedestrian crossing between the police station and the filling station on Tregolls Road to improve pedestrian access."
Cormac says the work is not expected to require lane closures or obstructive traffic management, nor to cause any restrictions or delays to journeys.