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A1 between J1 and J2, Hertfordshire (Grid ref TL223050) A1001 between A1(M) and A1000, Hertfordshire (Grid ref TL220062) U, Hall Gardens, Hertfordshire (Grid ref TL209057) A1 between J2 and J3, Hertfordshire (Grid ref TL214065) A1000 between Dixons Hill Rd and A1001, Hertfordshire (Grid ref TL235064) U, Travellers Lane, Hertfordshire (Grid ref TL225069) U, Station Road, Hertfordshire (Grid ref TL240042) C, Coursers Road, Hertfordshire (Grid ref TL201046) A1001 between A1(M) jn2 and A1(M) jn3, Hertfordshire (Grid ref TL214070) U, Deerswood Avenue, Hertfordshire (Grid ref TL227074) A414 between A1081 and A1(M), Hertfordshire (Grid ref TL203067) C, Blue Bridge Road, Hertfordshire (Grid ref TL244033) A1000 between B158 and Dixons Hill Rd, Welham Green, Hertfordshire (Grid ref TL250055) A1000 between A1001 and A414W, Hertfordshire (Grid ref TL230080) A1001 between A1(M) and A1057, Hertfordshire (Grid ref TL212080) B6426, Cavendish Way, Hertfordshire (Grid ref TL221084) A1057 between Poplar Avenue and A1001, Hertfordshire (Grid ref TL210082) A1057 between Lyon Way, St Albans and Poplar Avenue, Hatfield, Hertfordshire (Grid ref TL200078) A1081 between B556 W and M25 (midpoint), Hertfordshire (Grid ref TL190032) A1000 between B157 and B158, Hertfordshire (Grid ref TL259041)