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C, Roundwood Lane, Hertfordshire (Grid ref TL113149) A1081 between B653 and The Common, Hertfordshire (Grid ref TL129150) C, Clarence Road, Hertfordshire (Grid ref TL130150) A5183 between B487 and A5, Hertfordshire (Grid ref TL100137) C, Hollybush Lane, Hertfordshire (Grid ref TL131151) 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) A1081 between The Common, Harpenden and Hertfordshire boundary, Hertfordshire (Grid ref TL100169) A1081 between B487 and B653, Hertfordshire (Grid ref TL136136) A5 between B4540 and M1 jn9, Hertfordshire (Grid ref TL086150) A5183 between B487 and B487, Hertfordshire (Grid ref TL110119) B652, Station Road, Hertfordshire (Grid ref TL143147) U, Porters Hill, Hertfordshire (Grid ref TL143155) U, Northfield Road, Hertfordshire (Grid ref TL142157) U, North Common Road, Hertfordshire (Grid ref TL101118) U, West Common Way, Hertfordshire (Grid ref TL134124) A1081 between Beesonend Lane and B487, Hertfordshire (Grid ref TL137125)