START on A10 at northern end of lay-by approximately half a mile south of Rush Green flyover rab (junction of A10 and A414). proceed south past exits for Harlow (A414) and Hoddesdon (A1170), to:- TURN (4.968 miles) at Turnford flyover rab (sign-posted Broxbourne, Wormley, Turnford A1170). encircle rab to take 3rd. exit onto slip road to join A10 northbound. continue North on A10 past exits for Hoddesdon (A1170), Harlow (A414), Hertford (A414), Stevenage & Ware (A602) and Ware North, Wadesmill & Thundridge (A1170) to:- TURN (17.5 miles) at Puckeridge South rab (Standon) to take A10 (south/London) past exits for Ware North, Wadesmill & Thundridge (A1170), Stevenage & Ware (A602) and Hertford (A414) to:- FINISH on A10 at southern end of start lay-by approximately half a mile south of Rush Green flyover rab (junction of A10 and A414).