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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)