- A466 between B4348 and A49(T), Herefordshire, County of (Grid ref SO493310)
- A466 between B4348 and Herefordshire, County of boundary, Herefordshire, County of (Grid ref SO500176)
- A466 between Monmouthshire boundary and A466 Dixton Rd/Monk St, Monmouthshire (Grid ref SO508150)
- A466 between A466 split and A40, Monmouthshire (Grid ref SO510129)
- A466 between A466 North Parade/Monk St and A40, Monmouthshire (Grid ref SO512132)
- A466 between A40 and A4136, Monmouthshire (Grid ref SO512127)
- A466 between A4136 and Monmouthshire boundary, Monmouthshire (Grid ref SO520118)
- A466 between B4293 and A48, Monmouthshire (Grid ref ST524940)
- A466 between B4293 and Monmouthshire boundary, Monmouthshire (Grid ref SO532000)
- A466 between A 48T and M48 JCT 2, Monmouthshire (Grid ref ST532920)
- A466 between A 48T and M48 Junction 2, Monmouthshire (Grid ref ST532920)
- A466 between Bigsweir and Redbrook, Gloucestershire (Grid ref SO536100)