The length of the trunk road ceasing to be a trunk road is situated between its roundabout junction with the Bedford Southern Bypass and the Black Cat roundabout junction with the A1 Trunk Road from a point on the existing A421 Trunk Road about 135 metres west of its junction with the C44 Water End Road for a distance of about 7.23 kilometres to a point on the existing A421 Trunk Road about 305 metres west of its junction with the existing A1 Trunk Road and is shown by broad black dashes on the plan numbered HA 10/MP/013, marked “The A421 Trunk Road (Great Barford Bypass) Detrunking Order 2003” signed by authority of the Secretary of State for Transport and deposited at Records Management Branch, Room F13, Ashdown House, Sedlescombe Road North, St Leonards on Sea, Hastings, East Sussex TN37 7GA.