Bypasses
For part of its route between Leighton Buzzard and Dunstable it uses the former route of the Leighton Buzzard to Luton railway as far as Dunstable railway (the Leighton Buzzard bypass). It also shares its route with the A5 near Dunstable and the A1081 near Luton Airport (grid reference TL 110 206). 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.
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