4 Digits (45xx)
| Road | From | To | Notes |
|---|---|---|---|
| B4500 | B5070 at Chirk, Wrexham | B4580 at Llanrhaeadr, Powys | |
| B4505 | A4251 at Hemel Hempstead | A416 at Newtown, Chesham | |
| B4509 | B4060 at Wickwar | A38 at Falfield | |
| B4511 | A4049 at Aberbargoed | A4048 at Bedwellty | |
| B4512 | A4058 at Ystrad | A4233 near Tylorstown | |
| B4514 | B4217 in Acock's Green, Birmingham | A41 in Olton, Birmingham | |
| B4516 | B4145 in Saltley, Birmingham | B4114 in Washwood Heath, Birmingham | |
| B4517 | A4037 in Tipton, West Midlands | A461 in Great Bridge, West Midlands | |
| B4518 | A470 at Rhayader, Powys | Llanbrynmair | |
| B4519 | A483 at Garth, Powys | B4520 north of Upper Chapel, Powys | runs beside MoD's artillery range on Mynydd Epynt |
| B4520 | A483 at Builth Wells, Powys | B4601 at Brecon, Powys | |
| B4521 | A49 five miles west of Ross-on-Wye, Herefordshire | A40 at Abergavenny, Monmouthshire | Road is approximately 20 miles long, heading in a south westerly direction from Herefordshire into South Wales. Near its western end it forms a part of the border of the Brecon Beacons National Park. |
| B4522 | A4061 at Treherbert, Rhondda Cynon Taf | Blaencwm, Rhondda Cynon Taf | Road lasts approximately ¾ of a mile. Although on OS maps it is not displayed as the B4522, it is signposted as the B4522 on the A4061 in the local vicinity. Maps show it as Dunraven/Gwendoline Street, Treherbert. |
| B4524 | A48 near Corntown, Vale of Glamorgan | B4265 at Ewenny, Vale of Glamorgan | |
| B4525 | A422 at Middleton Cheney, Banbury | A43 near Syresham, Brackley | Road begins 1 mile east of the M40 J11 and is classified as a country route which connects to the A43, whilst bypassing Brackley. This road has been greatly truncated at its eastern end; formerly it ran to Northampton by way of Thorpe Mandeville, Moreton Pinkney, Adstone, Litchborough and Bugbrooke this route has been declassified. |
| B4526 | Goring, Oxfordshire | A4074 near Woodcote, Oxfordshire | |
| B4528 | A420 in Chippenham | B4158 Malmesbury Road in Chippenham | Road is ½ a mile long. |
| B4529 | A4110 near Leominster, Herefordshire | B4360 near Leominster | |
| B4530 | A4113 at Walford, Herefordshire | A4110 at Adforton, Herefordshire | |
| B4531 | A4040 in Erdington, Birmingham | A5127 in Erdington | |
| B4532 | A456 in Edgbaston, Birmingham | B4217 in Edgbaston | |
| B4534 | A3102 in Freshbrook, Swindon | A4311 in Blunsdon | Begins near M4 J16 and banks in a north-westernly direction. A change in the road system in Blunsdon meant closure of part of the original route at Lady Lane, which is no longer accessible to motor vehicles. The B4534 regains its status at the northern end of Lady Lane where it continues to its terminus at the A4311. |
| B4536 | B4084 in Pershore | A4104 on the outskirts of Pershore | |
| B4537 | A461 in Wollaston, West Midlands | A458 near Wollaston | |
| B4540 | B4506 near Edlesborough | A5 near Dunstable | |
| B4541 | B489 in Dunstable | B4540 near Whipsnade | |
| B4542 | A4125 in Eastbury | A4125 near Oxhey and A4008 in South Oxhey | |
| B4544 | A429 in Coventry | A4600 in Coventry | |
| B4545 | A5 at Valley | A5154 at Holyhead | |
| B4546 | A487/A478 road roundabout near Cardigan | Poppit Sands | goes through St Dogmaels |
| B4547 | A4086 at Cwm-y-glo | A4244 / B4366 | |
| B4548 | A487 near Cardigan | Gwbert | |
| B4549 | A456 Bewdley Hill at Kidderminster, Worcestershire | A451 Stourport Road at Kidderminster | Sutton Park Road; 1 mile long |
| B4550 | Near A38 in Worcester | Near A4536 in Worcester | Road links Worcester City Centre to the north of Worcester. |
| B4551 | A456/A459 in Halesowen, West Midlands | A491 near Lydiate Ash, Worcestershire | |
| B4553 | B4040 in Cricklade | A3102 in Toothill | |
| B4555 | Bridgnorth, Shropshire | B4363 near Highley, Shropshire | |
| B4557 | A406, Neasden | B4565 at Wembley Stadium | Link road between Wembley Stadium and industrial estates with Ikea store and Tesco in Brent Park |
| B4558 (England) | A459 in Upper Gornal, Dudley | B4176 in Dudley Town Centre | Roads named Burton Road, Highland Road and Salop Street |
| B4558 (Wales) | A40 east of Brecon | A4077 southwest of Crickhowell | Parallels A40 in the Usk valley; passes through Pencelli, Talybont-on-Usk, Cwm Crawnon and Llangynidr |
| B4560 | A40 near Bwlch | A4047 at Beaufort, Blaenau Gwent | Media related to B4560 road (Wales) at Wikimedia Commons |
| B4564 | A4093 at Hendreforgan | B4564 at Gilfach Goch | |
| B4565 | A4089 at Wembley Park | A404 at Wembley Clock Tower | Along Empire Way past Wembley Stadium complex |
| B4568 | A470 near Caersws, Powys | B4389 near Newtown, Powys | |
| B4569 | B4518 at Llanidloes, Powys | B4568 at Caersws, Powys | |
| B4570 | A484 near Cardigan | B4333 at Cwm-cou | |
| B4573 | A496 at Harlech, Gwynedd | A496 | |
| B4574 | A4120 at Devil's Bridge, Aberystwyth | B4518 near Rhayader, Powys | Described by the AA as one of the ten most scenic drives in the world. |
| B4576 | A485 at Abermad, Ceredigion | B4342 at Nantcwnlle, Ceredigion | |
| B4579 | A5/A483 at Oswestry, Shropshire | B4500 at Glyn Ceiriog, Wrexham | |
| B4580 | A5/A495 at Oswestry, Shropshire | B4391 near Llanfyllin, Powys | |
| B4587 | B4176 in Dudley Town Centre | B4177 in Dudley | |
| B4590 | A454 near Willenhall, West Midlands | A462 near Willenhall | |
| B4591 | B4237 at Newport | A467 at Abercarn | The former A467 route into central Newport. |
| B4595 | A4058 near Pontypridd | A4119 at Talbot Green | Road originally started at Llantwit Fardre but following the completion of the Church Village bypass, most of the former A473 route became part of the B4595. The A4058 near Glyntaff also became part of the B4595. This road also has three road links, one near the A470 in Glyntaff where the A4058 originally started, the other in Tonteg near Powerstation hill and another near Beddau where the A473 originally ran. |
| B4596 | B4591 at Newport | B4236 at Caerleon Bridge | The former A449 route into central Newport. |
| B4599 | A4067 in Ystalyfera | A4067 near Penrhos |
Read more about this topic: B Roads In Zone 4 Of The Great Britain Numbering Scheme