F2/15B

START at paint mark, eastern end of the flyover where St Neots Road crosses the A428 and head eastwards over first roundabout to Hardwick junction. Take 2nd exit from roundabout to cross A428 then 2nd exit at northern roundabout to join A428 eastwards. Exit A428 at first slip road signposted London (M11), to TURN at Madingley roundabout by taking take 4th exit onto A428 westbound. Continue past Hardwick to exit A428 via slip road to Cambourne junction. At first roundabout take 3rd exit to cross A428 then 3rd exit at the northern roundabout to re-join A428 eastwards. Proceed past Hardwick to turn again at Madingley roundabout then after re-joining A428 westwards, leave at the first slip road signposted Hardwick. At the roundabout take the 2nd exit onto St Neots Road (heading back towards the start) to Finish approximately 0.6 mile on that road, prior to the BP Garage.