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The new 10-mile dual carriageway will link the Black Cat roundabout in Bedfordshire and Caxton Gibbet in Cambridgeshire. Paul Salmon, senior project manager with National Highways, spoke to the ÃÛÑ¿´«Ã½â€™s Helen Mulroy. Image: Aerial view of what the A421 and A1 link will look like/National Highways.