- A43 between M 40 J 10 and Oxfordshire boundary, Oxfordshire (Grid ref SP550296)
- A43 between Northamptonshire boundary and A421, Northamptonshire (Grid ref SP576332)
- A43 between A421 and A422, Northamptonshire (Grid ref SP578340)
- A43 between A422 and A422, Northamptonshire (Grid ref SP590362)
- A43 between A422 and A413, Northamptonshire (Grid ref SP594379)
- A43 between A413 and A5(T), Northamptonshire (Grid ref SP682479)
- A43 between M1 and A43 main route, Northamptonshire (Grid ref SP726571)
- A43 between A43 main route and M1, Northamptonshire (Grid ref SP726573)
- A43 between A5(T) and A43 southern spur to M1, Northamptonshire (Grid ref SP726569)
- A43 between A43 spur and A45, Northamptonshire (Grid ref SP726580)
- A43 between A43 spur and A43 spur, Northamptonshire (Grid ref SP727571)
- A43 between A5076 and A43 trunk, Northamptonshire (Grid ref SP788651)
- A43 between A4500 and A5123/A5076, Northamptonshire (Grid ref SP789639)
- A43 between A43 principal and Overstone Lane, Northamptonshire (Grid ref SP790655)
- A43 between A45 and A4500, Northamptonshire (Grid ref SP794617)
- A43 between Overstone Lane, Northampton and A14(T), Northamptonshire (Grid ref SP799674)
- A43 between A6183 and A6003, Northamptonshire (Grid ref SP860825)
- A43 between A14(T) and A6003/A6900, Northamptonshire (Grid ref SP861806)
- A43 between A6003/A6900 and A4300, Northamptonshire (Grid ref SP871811)
- A43 between A6003 and A6116, Northamptonshire (Grid ref SP883858)
- A43 between A4300 and A6116, Northamptonshire (Grid ref SP897842)
- A43 between A6116 and A6086, Northamptonshire (Grid ref SP910875)
- A43 between A6086 and A427, Northamptonshire (Grid ref SP914888)
- A43 between A427 and A47, Northamptonshire (Grid ref SK986002)
- A43 between A47 and Northamptonshire boundary, Northamptonshire (Grid ref TF000031)
- A43 between Peterborough boundary and A1, Peterborough (Grid ref TF022054)
- A43 between A1 and Peterborough boundary, Peterborough (Grid ref TF026060)
- A43 between Lincolnshire boundary and Wothorpe Rd, Lincolnshire (Grid ref TF030065)
- A43 between Wothorpe Rd and B1081, Lincolnshire (Grid ref TF030068)