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A5183 between B487 and A5, Hertfordshire (Grid ref TL100137) 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) C, Roundwood Lane, Hertfordshire (Grid ref TL113149) U, North Common Road, Hertfordshire (Grid ref TL101118) M1 between J9 and Hertfordshire boundary, Hertfordshire (Grid ref TL091153) A5 between B4540 and M1 jn9, Hertfordshire (Grid ref TL086150) A5183 between B487 and B487, Hertfordshire (Grid ref TL110119) B487, Hertfordshire (Grid ref TL102115) A1081 between B653 and The Common, Hertfordshire (Grid ref TL129150) M1 between J8 and J9, Hertfordshire (Grid ref TL097105) C, Clarence Road, Hertfordshire (Grid ref TL130150) A1081 between The Common, Harpenden and Hertfordshire boundary, Hertfordshire (Grid ref TL100169) C, Wood End Lane, Hertfordshire (Grid ref TL066136) C, Hollybush Lane, Hertfordshire (Grid ref TL131151) A1081 between B487 and B653, Hertfordshire (Grid ref TL136136) U, West Common Way, Hertfordshire (Grid ref TL134124) A1081 between Beesonend Lane and B487, Hertfordshire (Grid ref TL137125)