Work on one of the UK’s first Dutch-style roundabouts is £1M over budget and will overrun by three months.
The unusual people-friendly roundabout in Cambridge will improve road safety by giving priority to pedestrians and cyclists.
Work on the £800,000 project began in September, with work expected to finish by April.
However, “major challenges with utility company cabling and pipework” mean it will now be completed early in the summer.
Cambridgeshire County Council said additional work to re-route and divert cabling away from the centre of the roundabout and build new inspection chambers will be necessary.
The council added: “In total, almost 700m of new ducting has been installed, a new telegraph pole built, more than 200m of ducting moved, new chambers constructed and six new water valves/fire hydrants built on the edges of the scheme.”
The Council's economy and environment committee chair Ian Bates said he is “pleased” with how the project is progressing.
“Whilst there is a slight delay from spring to summer it would have been remiss of us not to let the utility companies take advantage of the opportunity to improve their network in the area.
“Ultimately, Addenbrooke’s, the Cambridge Biomedical Campus, Queen Edith businesses and residents will now benefit from an improved utility and cabling network and the road is less likely to be dug up again in the near future.
“This project will improve the experience for everyone using the roundabout and our aim is to encourage more people to cycle more often, more safely and support healthy communities.”
From early April, the roundabout will be reopened to traffic - with the exception of the Queen Edith’s arm to Hills Road - and temporary traffic lights will remain.
Once completed, cyclists will have a dedicated cycle path to give them equal priority with pedestrians over oncoming motorists. For pedestrians, there will be crossings on all four entry and exit roads and at crossing points over the cycle paths. The design of the roundabout will also encourage motorists to drive at a slower speed.
In 2018, Cambridgeshire County Council secured a contribution of £550,000 from the Department for Transport for the roundabout following public consultations in 2015 and 2016.