The section between Letchworth and Royston follows the Icknield Way, with the deviations of modern bypasses at Baldock and Royston. The £43 million Baldock bypass includes the Weston Hills Tunnel.
The stretch between Letchworth and Royston follows the Icknield Way, but modern bypasses at Baldock and Royston deviate from it. The £43 million Baldock bypass includes the Weston Hills Tunnel.