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A421 between A43 and Northamptonshire boundary, Northamptonshire (Grid ref SP586335) A421 between Oxfordshire boundary and A4421, Oxfordshire (Grid ref SP605333) A421 between A4421 and A413, Buckinghamshire (Grid ref SP691330) A421 between A413 and A413, Buckinghamshire (Grid ref SP706329) A421 between A413 and B4033 Nash Rd, Buckinghamshire (Grid ref SP720333) A421 between B4033 Nash Rd and Buckinghamshire boundary, Buckinghamshire (Grid ref SP800325) A421 between Milton Keynes boundary and B4034, Milton Keynes (Grid ref SP830328) A421 between B4034 and Rhoscolyn Drive, Milton Keynes (Grid ref SP840334) A421 between Rhoscolyn Drive and Grafton St, Milton Keynes (Grid ref SP850346) A421 between Standing Way and A5(T), Milton Keynes (Grid ref SP863360) A421 between A421 split and A4146, Milton Keynes (Grid ref SP880372) A421 between A4146 and Larsborough Rd/Bransworth Ave, Milton Keynes (Grid ref SP900380) A421 between Larsborough Rd/Bransworth Ave and A5130, Milton Keynes (Grid ref SP905380) A421 between A5130 and Milton Keynes boundary, Milton Keynes (Grid ref SP924384) A421 between Central Bedfordshire boundary and M1, Central Bedfordshire (Grid ref SP950376) A421 between Central Bedfordshire boundary and A421 North before M1, Central Bedfordshire (Grid ref SP950376) A421 between A507 and Central Bedfordshire boundary, Central Bedfordshire (Grid ref SP956375) A421 between Roundabout and Roundabout, Central Bedfordshire (Grid ref SP956373) A421 between Roundabout south of M1 oand on ramp and Rounabout south of M1 and flyover, Central Bedfordshire (Grid ref SP957373) A421 between Roundabout south of M1 oand on ramp and Rounabout south of M1 and flyover, Central Bedfordshire (Grid ref SP957373) A421 between Rounabout south of M1 and flyover and Roundabout south of M1, Central Bedfordshire (Grid ref SP957376) A421 between Roundabout south of M1 and A507, Central Bedfordshire (Grid ref SP959375) A421 between M1 and A5134, Central Bedfordshire (Grid ref TL000425) A421 between M1 and A5134, Central Bedfordshire (Grid ref TL000425) A421 between A507 and Central Bedfordshire boundary, Central Bedfordshire (Grid ref TL000425) A421 between A507 and Central Bedfordshire boundary, Central Bedfordshire (Grid ref TL000425) A421 between LA boundary and A5134, Bedford (Grid ref TL019449) A421 between A5134 and A421 split, Bedford (Grid ref TL034463) A421 between A5134 and A421 split, Bedford (Grid ref TL036463) A421 between A5134 and A421 split, Bedford (Grid ref TL036463) A421 between A421 split and A6, Bedford (Grid ref TL040464) A421 between A6(T) and A600, Bedford (Grid ref TL063473) A421 between A600 and A603, Bedford (Grid ref TL077479) A421 between A603 and A428, Bedford (Grid ref TL089500) A421 between A428(T) and A1(T), Bedford (Grid ref TL125535) A421 between A428(T) and A1(T), Bedford (Grid ref TL145540)