The A428 road between Cambridge and Bedford has been dualled as far as Caxton Gibbet (where it meets the A1198 between Royston and Huntingdon). The old road has been declassified and rerouted in several places.

I mapped all this on July 20. Also the village of Hardwick, west of Cambridge, and the northern half of the new town of Cambourne a few miles further west; there's still quite a bit to do there. Also enabled me to link up Scotland Road at Dry Drayton with Hardwick.