The length of the trunk road ceasing to be a trunk road is situated between the boundary of the City of Leicester at Thurnby (marked “A” on the plan) and the junction with the A1 Trunk Road at Wansford, in the District of Peterborough, in the County of Cambridgeshire (marked “B” on the plan). It is shown by broad black dashes on the plan and is approximately 47km in length.