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C, Buttington Hill, Gloucestershire (Grid ref ST547933) U, Thornwell Road, Monmouthshire (Grid ref ST536923) A48 between A466 and England, Monmouthshire (Grid ref ST530934) U, Bulwark Chepstow, Monmouthshire (Grid ref ST537916) A466 between A 48T and M48 JCT 2, Monmouthshire (Grid ref ST532920) A466 between A 48T and M48 Junction 2, Monmouthshire (Grid ref ST532920) M48 between J2 and Monmouthshire boundary, Monmouthshire (Grid ref ST540914) A466 between B4293 and A48, Monmouthshire (Grid ref ST524940) M48 between Gloucestershire boundary and Gloucestershire boundary, Gloucestershire (Grid ref ST551907) U, Mathern Chepstow, Monmouthshire (Grid ref ST521913) B4228, N/a, Gloucestershire (Grid ref ST546970) B4293, Itton Road, Monmouthshire (Grid ref ST511948) M48 between South Gloucestershire boundary and J1, South Gloucestershire (Grid ref ST569896) U, N/a, South Gloucestershire (Grid ref ST573895) M48 between M4 (23) and J2, Monmouthshire (Grid ref ST500911) A48 between Monmouthshire boundary and A466, Monmouthshire (Grid ref ST498903) A403 between B4055 and M48, South Gloucestershire (Grid ref ST560875) A466 between B4293 and Monmouthshire boundary, Monmouthshire (Grid ref SO532000) M48 between J1 and M4 (21), South Gloucestershire (Grid ref ST590872) M4 between J22 and J21, South Gloucestershire (Grid ref ST580865)