Start on the A10, in southern end of lay-by approximately half a mile south of Rush Green elevated RAB (junction of A10 and A414) at sixth cats eye north of post marked 51/28 (GR 358126). Proceed on A10 southbound carriageway past exits for Harlow (A414) and Hoddesdon (A1170) to turn by bearing left (4.6 miles) onto slip road (signposted Broxbourne, Wormley, Turnford A1170) to Turnford elevated RAB. Take second exit onto slip road to join A10 northbound carriageway. Retrace outward route, past exits for Hoddesdon and Harlow (A414) to finish on A10 northbound carriageway, at first cats eye south of northern end of lay-by island (GR 357126) approximately half a mile south of Rush Green elevated RAB.
Riders must not stop at the finish. Continue to next slip road up to traffic lights. Then left onto B1502.