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U, Station Road, Hertfordshire (Grid ref TL240042) A1 between J1 and J2, Hertfordshire (Grid ref TL223050) C, Blue Bridge Road, Hertfordshire (Grid ref TL244033) A1001 between A1(M) and A1000, Hertfordshire (Grid ref TL220062) A1000 between B158 and Dixons Hill Rd, Welham Green, Hertfordshire (Grid ref TL250055) A1000 between Dixons Hill Rd and A1001, Hertfordshire (Grid ref TL235064) U, Hall Gardens, Hertfordshire (Grid ref TL209057) C, Coursers Road, Hertfordshire (Grid ref TL201046) M25 between J23 and J22, Hertfordshire (Grid ref TL217011) A1000 between B157 and B158, Hertfordshire (Grid ref TL259041) U, Travellers Lane, Hertfordshire (Grid ref TL225069) A1 between J2 and J3, Hertfordshire (Grid ref TL214065) U, Swanley Bar Lane, Hertfordshire (Grid ref TL261031) A1000 between School Rd, Potters Bar and B157, Hertfordshire (Grid ref TL261030) A1000 between B156 and School Rd, Hertfordshire (Grid ref TL261020) A1001 between A1(M) jn2 and A1(M) jn3, Hertfordshire (Grid ref TL214070) U, Deerswood Avenue, Hertfordshire (Grid ref TL227074) A1 between A1 and M25, Hertfordshire (Grid ref TQ224999) A1 between A1M and M25, Hertfordshire (Grid ref TQ223998) A414 between A1081 and A1(M), Hertfordshire (Grid ref TL203067)