- 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)