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B653, Hertfordshire (Grid ref TL203132) A1 between J5 and J6, Hertfordshire (Grid ref TL223140) A1 between J4 and J5, Hertfordshire (Grid ref TL224120) B197, Great North Road, Hertfordshire (Grid ref TL223116) U, Applecroft Road, Hertfordshire (Grid ref TL229125) C, Codicote Road, Hertfordshire (Grid ref TL208161) A6129 between A1M / A1001 / A414 and B197, Hertfordshire (Grid ref TL227110) U, Howardsgate, Hertfordshire (Grid ref TL236130) A6129 between B197 and A1000, Hertfordshire (Grid ref TL235120) B195, Bridge Road, Hertfordshire (Grid ref TL239131) A1000 between A6129 and B195 W, Hertfordshire (Grid ref TL240121) A1 between J3 and J4, Hertfordshire (Grid ref TL224099) A1001 between A1057 and A1M / A414 / A6129, Hertfordshire (Grid ref TL225100) A1000 between A1000 split and A1M/B197 S, Hertfordshire (Grid ref TL233157) A414 between A1M / A1001 / A6129 and A1000 (midpoint), Hertfordshire (Grid ref TL229102) A1000 between B195W and Ring Rd Jct S, Hertfordshire (Grid ref TL244133) A1000 between A1000 Mundells and A1000 Hertford Rd, Hertfordshire (Grid ref TL241150) A1000 between A1000 split and A1M Jct 6/B656/B197, Hertfordshire (Grid ref TL234160) A1 between A1000 Hertford Road and A1000/B197, Hertfordshire (Grid ref TL235160) A1000 between Bessemer Rd and A1000 split, Hertfordshire (Grid ref TL240154)