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M25 between J21A and J22, Hertfordshire (Grid ref TL162027) B556, Harper Lane, Hertfordshire (Grid ref TL174023) U, Shenley Lane, Hertfordshire (Grid ref TL173037) B556, Bell Lane, Hertfordshire (Grid ref TL181027) U, High Street, Hertfordshire (Grid ref TL177043) A5183 between Park Street Lane and M10, Hertfordshire (Grid ref TL146045) A414 between M10 and A1081, Hertfordshire (Grid ref TL150048) A1081 between M25 Jct 22 and A414, Hertfordshire (Grid ref TL185040) U, Nightingale Lane, Hertfordshire (Grid ref TL174050) A5183 between A411 and Park Street Lane, St Albans, Hertfordshire (Grid ref TL163000) A1081 between B556 W and M25 (midpoint), Hertfordshire (Grid ref TL190032) A405 between M25 and Tippendell Lane, St Albans, Hertfordshire (Grid ref TL136039) U, Williams Way, Hertfordshire (Grid ref TQ169999) A405 between Tippendell Lane and M10, Hertfordshire (Grid ref TL140046) M10 between M1(7) and J1, Hertfordshire (Grid ref TL142051) A414 between M1 Junction 7 and Roundabout A414, A5183 and A405, Hertfordshire (Grid ref TL142051) U, Newberries Avenue, Hertfordshire (Grid ref TQ171996) U, School Lane, Hertfordshire (Grid ref TL133010) U, St Vincent Drive, Hertfordshire (Grid ref TL165061) A1081 between A414 and A5183, Hertfordshire (Grid ref TL160061)