START (GR367598) on old A428 eastbound, about 120 yds east of Hardwick RAB, 40 yards west of western end of Armco barrier. Proceed to Hardwick RAB where 1st exit onto A428 westbound, under Cambourne flyover junction to:- TURN (4.63 mls.) at Caxton Gibbett RAB (junction with A1198). Retrace A428 eastbound, under Cambourne flyover and Hardwick flyover to:- FINISH (GR377597) in layby, about ¾ mile past Hardwick F/O, at a point 22 yards east of (past) P sign. Police Area(s) Cambridgeshire