New roundabout opens at A46 Dunholme/Welton crash blackspot A safer junction for motorists The new A46 Dunholme/Welton roundabout is now fully open. | Photo: LCC The new A46 Dunholme/Welton roundabout is now fully open after a £5.6 million project of major works at the accident hotspot. The works started in July last year and had been scheduled to be opened to the public by the end of May 2021, but bad wether meant further closures were needed. Works carried out by Eurovia Contracting involved excavating 40,000 tonnes of material, installing over two miles of new kerning and 22 new street lighting columns.