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M25 between J23 and J22, Hertfordshire (Grid ref TL217011) A1 between A1 and M25, Hertfordshire (Grid ref TQ224999) A1 between A1M and M25, Hertfordshire (Grid ref TQ223998) A1 between A5135 and A1M, Hertfordshire (Grid ref TQ220990) C, London Road, Hertfordshire (Grid ref TQ194999) U, Redwood Rise, Hertfordshire (Grid ref TQ195985) M25 between J23 and J24, Hertfordshire (Grid ref TL249000) B5378, Cowley Hill, Hertfordshire (Grid ref TQ197982) A1081 between B556 W and M25 (midpoint), Hertfordshire (Grid ref TL190032) U, Denham Way, Hertfordshire (Grid ref TQ203978) C, Blue Bridge Road, Hertfordshire (Grid ref TL244033) C, Coursers Road, Hertfordshire (Grid ref TL201046) U, The Campions, Hertfordshire (Grid ref TQ190982) B556, Bell Lane, Hertfordshire (Grid ref TL181027) U, Station Road, Hertfordshire (Grid ref TL240042) A1 between J1 and J2, Hertfordshire (Grid ref TL223050) A1081 between LA boundary and M25, Hertfordshire (Grid ref TQ240976) A1000 between LA boundary and Hill Rise, Potters Bar, Hertfordshire (Grid ref TL258000) A1000 between Hill Rise and A111, Hertfordshire (Grid ref TL259007) A1000 between A111 and B156, Hertfordshire (Grid ref TL260009)