Work on third and final section of Grantham Southern Relief Road to start in April | Updated: 11:59, 04 March 2021 Construction of the third and final phase of the Grantham Southern Relief Road is set to start in April. Councillor Richard Davies, executive member for highways at Lincolnshire County Council, said: âWe're incredibly excited to break ground on the final section of the Grantham Southern Relief Road next month. "It's taken a lot of time and effort to get to this stage, but we'll soon be one step closer to cutting congestion and improving journey times in and around Grantham." North-facing view of new five-span bridge over East Coast main line. (44851591)