B roads in Zone 4 of the Great Britain numbering scheme
Road From To
B4500 B5070 at Chirk , Wrexham B4580 at Llanrhaeadr , Powys
B4501 A543 at Denbigh , Denbighshire A4214 at Fron-Goch , Gwynedd
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
B4520 A483 at Builth Wells , Powys B4601 at Brecon , Powys
B4521 A49 five miles west of Ross-on-Wye , Herefordshire A40 at Abergavenny , Monmouthshire
B4522 A4061 at Treherbert , Rhondda Cynon Taf Blaencwm , Rhondda Cynon Taf
B4524 A48 near Corntown , Vale of Glamorgan B4265 at Ewenny , Vale of Glamorgan
B4525 A422 at Middleton Cheney , Banbury A43 near Syresham , Brackley
B4526 Goring , Oxfordshire A4074 near Woodcote , Oxfordshire
B4528 A420 in Chippenham B4158 Malmesbury Road in Chippenham
B4529 A4110 near Leominster , Herefordshire B4360 near Leominster
B4530 A4113 at Walford , Herefordshire A4110 at Adforton , Herefordshire
4 digits ( 45xx )
B roads are numbered routes in Great Britain of lesser importance than A roads. See the article Great Britain road numbering scheme for the rationale behind the numbers allocated.