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A5 between M1 (midpoint) and A5183, Hertfordshire (Grid ref TL092146) M1 between M1 (midpoint) and A5183, Hertfordshire (Grid ref TL092146) M1 between M1 (midpoint) and A5183, Hertfordshire (Grid ref TL091146) A5 between M1 (midpoint) and A5183, Hertfordshire (Grid ref TL091146) M1 between J9 and Hertfordshire boundary, Hertfordshire (Grid ref TL091153) A5 between B4540 and M1 jn9, Hertfordshire (Grid ref TL086150) A5183 between B487 and A5, Hertfordshire (Grid ref TL100137) C, Roundwood Lane, Hertfordshire (Grid ref TL113149) A1081 between The Common, Harpenden and Hertfordshire boundary, Hertfordshire (Grid ref TL100169) C, Wood End Lane, Hertfordshire (Grid ref TL066136) U, North Common Road, Hertfordshire (Grid ref TL101118) A5183 between B487 and B487, Hertfordshire (Grid ref TL110119) B487, Hertfordshire (Grid ref TL102115) A5 between A4012 and A505, Hertfordshire (Grid ref TL064163) U, Pickford Road, Hertfordshire (Grid ref TL059161) M1 between LA boundary and J10, Central Bedfordshire (Grid ref TL087181) 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) A1081 between B653 and The Common, Hertfordshire (Grid ref TL129150) C, Clarence Road, Hertfordshire (Grid ref TL130150)