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A121 between B176 and A10, Hertfordshire (Grid ref TL355008) A121 between A1010 and B176, Hertfordshire (Grid ref TL362004) A121 between A121 / A1010 and Hertfordshire boundary, Hertfordshire (Grid ref TL374005) A121 between A112 and Essex boundary, Essex (Grid ref TQ382996) A121 between A112 and A121 Honey Lane roundabout, Essex (Grid ref TQ389994) A121 between A104 and Redbridge boundary, Redbridge (Grid ref TQ406934) A121 between A121 main route and Old Shire Lane, Essex (Grid ref TQ406998) A121 between Essex boundary and A1168, Essex (Grid ref TQ411946) A121 between A104 and A121 Honey Lane roundabout, Essex (Grid ref TQ420994) A121 between Baldwin's Hill and A104, Essex (Grid ref TQ429981) A121 between A1168 and Baldwin's Hill, Essex (Grid ref TQ430977)