4 Digits (46xx)
| Road | From | To | Notes |
|---|---|---|---|
| B4603 | A483/A4118 junction at Greenhill, Swansea | A4067 near Cilmaengwyn | |
| B4620 | A483 at Fforestfach | A4240 at Loughor | |
| B4632 | Stratford-upon-Avon | Cheltenham | Old A46. Passes through Winchcombe, Prestbury, near Stanton, Broadway, Aston-sub-Edge, Wootton-sub-Edge, Mickleton, Clifford Chambers |
| B4640 | Newbury | Tot Hill | Old A34 road. Until it was replaced by the Newbury Bypass it was originally the only part of the road between Oxford and Winchester that was not a dual carriageway. |
| B4642 | A4071 south west of Rugby, Warwickshire | A426 in central Rugby | Old route of the A4071 before the building of the Rugby Western Relief Road. |
| B4669 | B590 at Hinckley | B4114 at Sapcote |
Read more about this topic: B Roads In Zone 4 Of The Great Britain Numbering Scheme