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A1081 between M25 Jct 22 and A414, Hertfordshire (Grid ref TL185040) U, High Street, Hertfordshire (Grid ref TL177043) A1081 between B556 W and M25 (midpoint), Hertfordshire (Grid ref TL190032) U, Shenley Lane, Hertfordshire (Grid ref TL173037) B556, Bell Lane, Hertfordshire (Grid ref TL181027) U, Nightingale Lane, Hertfordshire (Grid ref TL174050) C, Coursers Road, Hertfordshire (Grid ref TL201046) B556, Harper Lane, Hertfordshire (Grid ref TL174023) M25 between J21A and J22, Hertfordshire (Grid ref TL162027) U, St Vincent Drive, Hertfordshire (Grid ref TL165061) U, Hall Gardens, Hertfordshire (Grid ref TL209057) C174, Colney Heath Lane, Hertfordshire (Grid ref TL180069) A1081 between A414 and A5183, Hertfordshire (Grid ref TL160061) A414 between A1081 and A1(M), Hertfordshire (Grid ref TL203067) A414 between M10 and A1081, Hertfordshire (Grid ref TL150048) U, Beaumont Avenue, Hertfordshire (Grid ref TL169074) A5183 between Park Street Lane and M10, Hertfordshire (Grid ref TL146045) A1 between J1 and J2, Hertfordshire (Grid ref TL223050) A1 between J2 and J3, Hertfordshire (Grid ref TL214065) U, Sandfield Road, Hertfordshire (Grid ref TL162073)