- A5 between B4540 and M1 jn9, Hertfordshire (Grid ref TL086150)
- M1 between J9 and Hertfordshire boundary, Hertfordshire (Grid ref TL091153)
- A5 between M1 (midpoint) and A5183, Hertfordshire (Grid ref TL091146)
- M1 between M1 (midpoint) and A5183, Hertfordshire (Grid ref TL091146)
- M1 between M1 (midpoint) and A5183, Hertfordshire (Grid ref TL092146)
- A5 between M1 (midpoint) and A5183, Hertfordshire (Grid ref TL092146)
- A5183 between B487 and A5, Hertfordshire (Grid ref TL100137)
- C, Wood End Lane, Hertfordshire (Grid ref TL066136)
- A1081 between The Common, Harpenden and Hertfordshire boundary, Hertfordshire (Grid ref TL100169)
- A5 between A4012 and A505, Hertfordshire (Grid ref TL064163)
- C, Roundwood Lane, Hertfordshire (Grid ref TL113149)
- U, Pickford Road, Hertfordshire (Grid ref TL059161)
- M1 between LA boundary and J10, Central Bedfordshire (Grid ref TL087181)
- U, Cavendish Road, Hertfordshire (Grid ref TL058165)
- A1081 between LA boundary and M1, Central Bedfordshire (Grid ref TL093183)
- A1081 between LA boundary and M1 junction 10a southern roundabout, Central Bedfordshire (Grid ref TL093183)
- U, North Common Road, Hertfordshire (Grid ref TL101118)
- M1 between J10 and J10A, Central Bedfordshire (Grid ref TL089187)
- M1 between J10 and J10A off ramp, Central Bedfordshire (Grid ref TL089187)
- B487, Hertfordshire (Grid ref TL102115)