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A1 between J1 and J2, Hertfordshire (Grid ref TL223050) U, Station Road, Hertfordshire (Grid ref TL240042) C, Blue Bridge Road, Hertfordshire (Grid ref TL244033) A1001 between A1(M) and A1000, Hertfordshire (Grid ref TL220062) A1000 between Dixons Hill Rd and A1001, Hertfordshire (Grid ref TL235064) U, Hall Gardens, Hertfordshire (Grid ref TL209057) A1000 between B158 and Dixons Hill Rd, Welham Green, Hertfordshire (Grid ref TL250055) U, Travellers Lane, Hertfordshire (Grid ref TL225069) A1 between J2 and J3, Hertfordshire (Grid ref TL214065) C, Coursers Road, Hertfordshire (Grid ref TL201046) A1001 between A1(M) jn2 and A1(M) jn3, Hertfordshire (Grid ref TL214070) A1000 between B157 and B158, Hertfordshire (Grid ref TL259041) U, Deerswood Avenue, Hertfordshire (Grid ref TL227074) M25 between J23 and J22, Hertfordshire (Grid ref TL217011) U, Swanley Bar Lane, Hertfordshire (Grid ref TL261031) A414 between A1081 and A1(M), Hertfordshire (Grid ref TL203067) A1000 between School Rd, Potters Bar and B157, Hertfordshire (Grid ref TL261030) A1000 between A1001 and A414W, Hertfordshire (Grid ref TL230080) A1000 between B156 and School Rd, Hertfordshire (Grid ref TL261020) A1081 between B556 W and M25 (midpoint), Hertfordshire (Grid ref TL190032)