External auditors commissioned by the Tees Valley Combined Authority (TVCA) are exploring the cost, economic benefits and environmental considerations of the scheme. About £1 billion of transport funding for the Tees Valley, which includes the link road, was eventually confirmed by Labour in June. Previous potential routes for the northern link road. (Image: )TVCA said: “Traffic is currently using the A1150 and A167 through the north of Darlington, but these routes are unsuitable for the volume and type of traffic using them. Praising the scheme last year, Tees Valley Mayor Ben Houchen said it will improve air quality in the town centre and divert trucks away from residential and commuter roads.