- A4042 between A4051 and A472, Torfaen (Grid ref ST296990)
- A4042 between A48 and A4042 spur, Newport (Grid ref ST300856)
- A4042 between A472 Pontymoel and A472 Berthon Rd, Torfaen (Grid ref SO300004)
- A4042 between A4051 and A4042 split, Torfaen (Grid ref ST304919)
- A4042 between A4051 and A4042 split, Torfaen (Grid ref ST304919)
- A4042 between A472 and A465/A40 intersection, Monmouthshire (Grid ref SO305100)
- A4042 between Torfaen boundary and A4042 split, Torfaen (Grid ref ST306919)
- A4042 between A4042 split and A4051, Torfaen (Grid ref ST308950)
- A4042 between A4051 and M4 spur, Newport (Grid ref ST310895)
- A4042 between A4051 and M4 spur, Newport (Grid ref ST310895)
- A4042 between slip to M4 and Newport boundary, Newport (Grid ref ST312910)
- A4042 between A4042 spur and A4051, Newport (Grid ref ST312880)
- A4042 between A4042 and A48, Newport (Grid ref ST313876)
- A4042 between A4042 and M4, Newport (Grid ref ST315900)
- A4042 between A4042 and A48, Newport (Grid ref ST319870)