- A418 between M40 spur/A40 and M40, Oxfordshire (Grid ref SP622050)
- A418 between M40 and A40, Oxfordshire (Grid ref SP630048)
- A418 between A329 and A40, Oxfordshire (Grid ref SP660053)
- A418 between A329 and Oxfordshire boundary, Oxfordshire (Grid ref SP692060)
- A418 between Buckinghamshire boundary and Buckinghamshire boundary, Buckinghamshire (Grid ref SP700066)
- A418 between Oxfordshire boundary and A4129, Oxfordshire (Grid ref SP705067)
- A418 between A4129 and Oxfordshire boundary, Oxfordshire (Grid ref SP707069)
- A418 between Buckinghamshire boundary and Coldharbour Way, Aylesbury, Buckinghamshire (Grid ref SP800123)
- A418 between Coldharbour Way and A41(T), Buckinghamshire (Grid ref SP811133)
- A418 between A41 / A413 and A4157, Buckinghamshire (Grid ref SP825143)
- A418 between A4157 and Rowsham Rd, Buckinghamshire (Grid ref SP835152)
- A418 between Rowsham Rd, Aylesbury and Buckinghamshire boundary, Buckinghamshire (Grid ref SP870209)
- A418 between Central Bedfordshire boundary and A505, Central Bedfordshire (Grid ref SP900238)