B roads in Zone 4 of the Great Britain numbering scheme

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.

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The numbering zones for roads in Great Britain

3 digits

Road	From	To	Notes
B400	A4 Fleet Street	A40 Holborn	Chancery Lane. One way only Northbound
B408	A315 King Street, Hammersmith	A4020 Shepherd's Bush	Road Names: Dalling Road, Paddenswick Road, Askew Road
B409	A402 Goldhawk Road, Stamford Brook	B490 at Acton Green	Road Names: Stamford Brook Road, Bath Road, South Parade
B412	A219 Shepherds Bush	A4207 Notting Hill	To the West of Ladbroke Grove it follows North Pole Road, St Quentin Avenue, St Marks Road and Cambridge Gardens. To the East, though Westbourne Park Road. Crosses Portobello Road.
B413	A5 Maida Vale	B450 Chamberlayne Road	In two parts: Maida Vale to Kilburn Park Road, and Kilburn Park Road to Kensal Green. Via Warwick Avenue tube station. Road Names: Clifton Road, Clifton Gardens, Warwick Avenue, Formosa Street, Shirland Road, Carlton Vale, Kilburn Lane
B414	A5 Maida Vale	A404 Harrow Road at Westbourne Green	Road Names: Kilburn Park Road, Walterton Road, Fernhead Road
B416	A4 Wellington Street / A332 roundabout at Slough	A413 Amersham Road at Gerrards Cross
B425	A45 in Sheldon, West Midlands	A41 in Solihull
B430	A34 at Weston-on-the-Green	M40 at Ardley
B439	A46 at Salford Priors	A4390 at Stratford-upon-Avon	Formerly the A439
B450	A402 at Holland Park	B451 at Kensal Rise	Much of this is Ladbroke Grove in Notting Hill and passes close to Portobello Road market.
B451	A404 at Kensal Green	A5 at Kilburn	Via Kensal Green railway station. Road Names: College Road, Mortimer Road, Harvist Road, Brondesbury Road
B452	A3002 at Brentford	A40 at Perivale	Via Brentford railway station, Northfields tube station and West Ealing railway station. Road Names: Windmill Road, Northfield Avenue, Drayton Green Road, Argyle Road, Teignmouth Gardens
B454	A315 at Isleworth	A4127 at Southall	Via Syon Lane railway station, and crosses Osterley Park. Road Names: Spur Road, Syon Lane, Windmill Lane.
B455	A315 at Brentford	A312/A4180 roundabout at Yeading	Via South Ealing tube station and Ealing Broadway railway station. Road Names: Ealing Road, South Ealing Road, Saint Mary's Road, Ealing Green, Bond Street, Ealing High Street, Ealing Broadway, Haven Green, Castlebar Road, Castlebar Hill, Kent Gardens, Scotch Common, Ruislip Road East, Greenford Broadway, Ruislip Road
B456	A40 Western Avenue	A4005 at Alperton	Road Name: Alperton Lane
B457	A4005 at Roxeth	A409 at Harrow	Via Harrow School and Harrow-on-the-Hill station. Road Names: London Road, Harrow High Street, Peterborough Road, Station Road
B461	A4140 at Stanmore	A5 at Edgware	Whitchurch Lane, past Canons Park station
B462	A411 at Bushey Arches	A5183 at Radlett
B465	A4020 at Hillingdon	A408 at Stockley Park	Road Name: West Drayton Road
B466	A4020 at Hillingdon	A404 at Pinner	Via West Ruislip railway station. Road Names: Long Lane, Ickenham High Road, Ickenham Road, Eastcote Road, Eastcote High Road, Cuckoo Hill
B467	A4020 at Uxbridge	B466 at Ickenham	Road Names: Harefield Road, Swakeleys Road
B469	A404 at Northwood	A4215 at Northwood	Via Northwood tube station. Road Name: Green Lane
B470	A408 at Cowley	A4 at Windsor	Via Langley railway station.
B471	Pangbourne, Berkshire	A4074 at Woodcote, Oxfordshire
B472	A404 at Northwood Hills	B466 at Eastcote	Via Northwood Hills tube station. Road Name: Joel Street
B473	A407 at Willesden	A4088 at Neasden	Via Neasden tube station. Road Name: Neasden Lane
B474	A40 at Beaconsfield	A404 at Hazlemere
B480	A4130 Fair Mile, Henley-on-Thames	Iffley
B481	A4155 Caversham	B480 just south of Watlington	Connects Reading to B4009 at Watlington and hence the M40 2.5miles north of Watlington
B482	A4155 Marlow	A40 Stokenchurch	By way of Lane End, Bolter End and Cadmore End
B483	A4020 at Uxbridge	A40 at Ickenham	Road Name: Park Road
B485	A416 at Chesham	A413 at Great Missenden
B488	Aston Clinton, Tring	A4146 south of Leighton Buzzard,	Begins at a grade separated junction east of Aston Clinton.
B489	B4009 at Aston Clinton	A5/A505 at Dunstable	Formerly started on the A41, now crosses the bypassed A41 and starts in Aston Clinton on the B4009.
B490	A315 at Chiswick	A4020 at Acton	Via Chiswick Park tube station. Road Names: Acton Lane, Beaconsfield Road, Acton Lane, Winchester Street
B491	A315 at Chiswick	B490 near Acton	Via Turnham Green tube station. Road Names: Turnham Green Terrace, The Avenue, Southfield Road

4 digits (40xx)

Road	From	To	Notes
B4000	A4/A34 at Speen, Berkshire	A361 at Highworth, Wiltshire	via Lambourn, Ashbury and Shrivenham
B4001	A4 at Hungerford, Berkshire	A417 north of West Challow	via Lambourn
B4004	Defunct		The former classification of Ringland Way in Newport. Subsequently reclassified A455, and then A48 as part of the Southern Distributor Road.
B4005	M4 Motorway junction 16 at Swindon and Wooton Bassett	A346 road east of Chiseldon	via Wroughton
B4008	Stroud	Quedgeley	Formerly part of the A419.
B4009	A4 / A339 at Newbury	A4074 south of Wallingford	Part One of B4009 route, follows route of the ancient Roman road Icknield Way. Links Oxfordshire with the western M4, crosses the River Thames at Goring-on-Thames and Streatley.
B4009	A4074 at Benson	A41 at Tring, Hertfordshire	Part Two of B4009 route; follows route of the ancient pre-Roman Icknield Way via Watlington, Chinnor and Wendover; links Oxfordshire, Buckinghamshire, Bedfordshire and Hertfordshire.
B4011	A418 at Thame	A41 near Bicester	via Long Crendon. Turnpiked in 1833.
B4015	A415 Clifton Hampden	B480 Chiselhampton
B4016	B4017 Drayton	A417 Blewbury	via Sutton Courtenay, Appleford-on-Thames and East Hagbourne
B4017	B4044 Farmoor	A4130 Milton Hill	via Cumnor, Abingdon and Drayton. The section of road between Abingdon and Milton Hill was formerly part of the A34.
B4019	Faringdon, Oxfordshire	A419 at Broad Blunsdon, Wiltshire	via Highworth
B4022	A40 at Cogges, Oxfordshire	A361 near Great Tew	via Witney, Charlbury and Enstone. The former route of the A40 between Cogges and Witney
B4025	A34 in Hall Green, Birmingham	A41 at Solihull
B4027	A40 at Wheatley	A44 at Glympton	by way of Beckley. Number formerly duplicated - road in Warwickshire once so numbered is now B4428
B4030	A44 near Enstone	B4100 at Bicester Town Centre	via Church Enstone, Gagingwell, Westcott Barton, Middle Barton, Bartongate, Hopcroft's Holt, Lower Heyford and Middleton Stoney. Turnpiked in 1797 and disturnpiked in 1876.
B4031	A361 near Great Tew	A43 near Croughton, Northamptonshire	via Deddington
B4032	A413 near Winslow	A4146 at Linslade
B4033	A413 near Winslow, Buckinghamshire	A421 near Nash, Buckinghamshire
B4034	A421 in south western Milton Keynes	A422 in northern Milton Keynes	For much of route is more commonly referred to as the V8 Marlborough Street Multimap incorrectly assigns this number to the B4304 in Llanelli
B4035	Banbury	A4184 in Evesham	via Broughton, Tadmarton, Swalcliffe, Brailes, Shipston-on-Stour, Chipping Campden, Bretforton and Badsey
B4036	Daventry	A5 at Long Buckby Wharf	Formerly continued to Market Harborough via Naseby, site of the English Civil War battle of that name, and ran close to a junction with the A14 and M1 junction 18
B4037	A361 at Badby	A45 near Dodford	Road is about 3 miles (5 km). Goes via Newnham.
B4038	A361/A5 at Kilsby	A428 at Hillmorton	Road can be accessed from the A5 or A361. Road was formerly much longer as it is what is now part of the A361 between Daventry and Kilsby. Today the road is only about 3 miles (5 km), linking Kilsby and Rugby, whilst bypassing J18 of the M1.
B4039	A420 west of Chippenham	B4040 at Acton Turville
B4040	A46 at Old Sodbury, South Gloucestershire	A419 at Cricklade, Wiltshire	via Malmesbury
B4042	A429 in Malmesbury, Wiltshire	A3102 in Wootton Bassett, Wiltshire
B4043	A458 in Quinton, West Midlands	A456 in Halesowen, West Midlands
B4044	A420 at Botley	A40 at Eynsham	Passes over Swinford Toll Bridge. Part of the A40 until the 1930s, later renumbered as the A4141.
B4046	A420 in Kingswood, South Gloucestershire	A431 in Hanham|
B4047	Witney, Oxfordshire	A40 west of Minster Lovell	Former route of the A40
B4048	A432 in Fishponds, Bristol	A4017 near Kingswood, South Gloucestershire	Lodge Causeway
B4051	A4018 at Park Street top, Bristol	M32, Junction 3	Park Row, Marlborough St and Ashley Road
B4052	B4051 at Sussex Place, Bristol	A38 at Horfield, Bristol	Ashley Hill and Ashley Down Road
B4053	The Centre, Bristol	Temple Gate, Bristol	Baldwin Street, Bristol Bridge and Victoria Street
B4054	A38 at Gloucester Road, Bristol	A4 at Avonmouth	Cranbrook Road, Parry's Lane and Shirehampton Road
B4055	A4018 at Westbury-on-Trym, Bristol	New Passage	The route is in two parts separated by a mile of the A4018. One runs from Westbury-on-Trym through Henbury to the south end of Cribbs Causeway and the other from J17 of the M5 to New Passage.
B4056	A4018 at Durdham Down, Bristol	A38 at Filton	Henleaze Road and Southmead Road
B4057	B4054 at Kingsweston	A4018 at Brentry	Part One
B4057	A38 at Patchway	B4058 at Winterbourne, Gloucestershire	Part Two: the two parts are separated by Filton Airfield, and were connected before the runway was extended in 1949.[1]
B4058	A432 at Eastville, Bristol	A46 at Nailsworth
B4059	A432 at Yate	B4427 at Earthcott	via Iron Acton
B4060	A432 at Yate	A4136 at Cam	via Wotton under Edge
B4061	A38 at Alveston, Glos	A38 near Whitfield	Connects Thornbury with the A38
B4062	B4058 east of Charfield, Gloucestershire	B4060 at Kingswood, Stroud District
B4063	A40 west of Cheltenham	Gloucester	Formerly part of the A40
B4066	A419 at Dudbridge, Gloucestershire	Sharpness	via Dursley and Berkeley
B4068	A436 west of Naunton, Gloucestershire	Stow-on-the-Wold
B4069	A3102 north of Lyneham	Chippenham, junction with A420	Formerly part of the A420
B4070	A417 at Birdlip, Gloucestershire	Stroud
B4071	A38 south of Whitminster, Gloucestershire	Saul, Gloucestershire
B4072	Gloucester	A38 at Tuffley
B4073	Gloucester	A46 at Painswick
B4077	A46 & A435 at the Teddington Hands east of Tewkesbury	A429 in Stow-on-the-Wold	via Teddington, Toddington, Stanway, Ford and Upper Swell
B4078	Winchcombe, Gloucestershire	A46 at Sedgeberrow
B4081	A44 west of Blockley, Gloucestershire	B4632 at Mickleton	via Chipping Campden
B4086	A422 in Stratford-upon-Avon	B4100 near Warmington	via Tiddington, Wellesbourne, Compton Verney, Kineton and Edge Hill
B4087	B4086 in Wellesbourne, Warwickshire	A422 and |A445 in Leamington Spa, Warwickshire	via Whitnash, Warwickshire
B4098	A51 south of Kingsbury, Warwickshire	Coventry City Centre	Entire route formerly classified A423 via Nether Whitacre, Furnace End, Over Whitacre, Fillongley, Corley and Coundon
B4099	A445 in western Leamington Spa	A425 in south-eastern Leamington Spa

4 digits (41xx)

Road	From	To	Notes
B4100	Bicester	M40 near Bishop's Tachbrook (and upon reprisal - A441 Digbeth).	Former alignment of A41 prior to the opening of M40. Starts in Bicester near the Bicester Village designer outlet and crosses the A43 near M40 J10. Continues via Baynards Green and Aynho then multiplexes with the A4260 from Adderbury for approximately 3.5 miles. It then regains its status from the Warwick Road, Banbury for less than ½ a mile as it becomes the A422 briefly. It then fully regains its status as the B4100, near Drayton where it continues for 14 miles passing M40 J12 & J13 at Gaydon and Warwick, respectively. The road is briefly reprised in Birmingham City Centre as a continuation of the A41 until it meets with the A441 in Digbeth.
B4101	Coventry City Centre	Redditch Town Centre	Passes through the villages of Balsall Common, Knowle, Dorridge, Hockley Heath, Wood End and Aspley Heath
B4102	Nuneaton Town Centre	B4101 near Earlswood, West Midlands
B4103	A452 at Kenilworth	A452 near Kenilworth
B4104	A452 at Kenilworth	B4103 at Kenilworth
B4106	A4114 at Allesley, Coventry	B4101 at Spon End, Coventry
B4107	A429 at Earlsdon, Coventry	B4098 at Radford, Coventry
B4109	Coventry City Centre	Hinckley Town Centre
B4110	B4109 at Hillfields, Coventry	A45/A46 at Willenhall, Coventry
B4111	B4114 in Hartshill, Nuneaton	Atherstone
B4112	A426 in Rugby, Warwickshire	B4114 in Church End, Warwickshire
B4113	A444 in Nuneaton	A452 near Leamington Spa
B4114	A47 in Saltley, Birmingham	A5460 at Fosse Shopping Park, Leicestershire	Connects Birmingham to Coleshill
B4115	A45 in Finham, Coventry	A46/A429 near Warwick
B4116	B4098, B4114 at Over Whitacre, Warwickshire	B5006 near Measham, Leicestershire
B4117	B4118 in Water Orton, Warwickshire	A446, near Coleshill, Warwickshire
B4118	Castle Bromwich, West Midlands	A446, near Water Orton, Warwickshire
B4118	Castle Bromwich, West Midlands	A446, near Water Orton, Warwickshire
B4119	B4118 in Castle Bromwich, West Midlands	B4114 in Castle Bromwich
B4120	A38 in Longbridge, Birmingham	A441 near Alvechurch, Worcestershire
B4121	A4123 at Quinton, Birmingham	A441 at Cotteridge, Birmingham
B4122	A435 in King's Heath, Birmingham	A4040 in King's Heath
B4124	A4540 in Ladywood, Birmingham	A4040 in Harborne, Birmingham
B4124	A41 in Hockley, Birmingham	A34 in Great Barr, Birmingham
B4125	A456 in Edgbaston, Birmingham	A4092 in Smethwick, West Midlands
B4126	A41 in Sparkbrook, Birmingham	B4145 near Small Heath, Birmingham
B4127	A38 Suffolk Street Queensway in Birmingham	A4540 Islington Row Middleway in Birmingham
B4128	A45/A4540 in Bordesley, Birmingham	A4040 near Stechford, Birmingham
B4129	A457 in Cape Hill, Birmingham	A4040 in Harborne, Birmingham
B4132	A41 in Birmingham	A38(M) at Aston
B4133	A4540 Dartmouth Middleway, Birmingham	A47 in Nechells, Birmingham
B4135	A457 in Smethwick, West Midlands	A457 in Cape Hill, Birmingham
B4136	A4092 in Smethwick, West Midlands	A41 in Handsworth, Birmingham
B4137	A4040 in Witton, Birmingham	A47 in Nechells, Birmingham
B4138	A453 in Perry Barr, Birmingham	A4026 in Little Aston, Staffordshire
B4140	A41 in Hockley, Birmingham	A4040 in Witton, Birmingham
B4142	A5127 in Erdington, Birmingham	A453 in New Oscott, Birmingham
B4144	A41 in Hockley, Birmingham	B4132 in Nechells, Birmingham
B4145	A41 in Sparkhill, Birmingham	B4114 in Saltley, Birmingham
B4146	A41 in Tyseley, Birmingham	A435 in King's Heath, Birmingham
B4147	A4040 in Stechford, Birmingham	B4114 in Hodge Hill, Birmingham
B4148	A453 in Whitehouse Common, Sutton Coldfield	A38 in East Birmingham; A5127 in Erdington	Two branches south/west of Walmley
B4149	B4166 in Greets Green, West Midlands	A4041 in West Bromwich
B4149	A4041 in Pheasey, West Midlands	A453 in New Oscott, Birmingham
B4150	A420 Headington Hill	A40 Oxford Northern Bypass	Marston Road and Marsh Lane in Oxford.
B4151	A4148 in Walsall	A453 near Bassetts Pole, Warwickshire	Terminus is actually in Staffordshire
B4152	A454 in Aldridge, West Midlands	A452 in Brownhills, West Midlands
B4154	A4041 in Pheasey, West Midlands	B5013 in Hednesford, Staffordshire
B4155	A452 in Brownhills, West Midlands	A5 near Brownhills, in Staffordshire
B4156	A460 in Fallings Park, Wolverhampton	A34 in Great Wyrley, Staffordshire
B4158	Chippenham, junction with A420	A350 north of Chippenham	This is known as Malmesbury Road in Chippenham
B4160			Redditch Ring Road. One-way throughout its length.
B4161	A4039 in Blakenhall, Wolverhampton	A41 near Tettenhall
B4162	A41 in Bilston	A4039 in Bilston
B4163	A41 in Bilston	A461 in Dudley Port, Sandwell
B4166	A461 near Great Bridge, West Midlands	A4034 in Oldbury, West Midlands
B4167	B4124 in Hamstead, Birmingham	A4041 in Great Barr, West Midlands
B4169	Smethwick Town Centre, West Midlands	A4034 in Blackheath, West Midlands	Divides into two branches, each joining A4034 north and south of Blackheath
B4170	A457 in Oldbury, West Midlands	B4169 in Langley Green, West Midlands
B4171	Dudley, West Midlands	Blackheath, West Midlands
B4172	A461 in Brierley Hill	A4100 in Brierley Hill
B4173	A459 in Netherton, West Midlands	A458 in Cradley
B4174	A4100 in Quarry Bank, West Midlands	A458 in Cradley
B4175	A449 in Wall Heath	A457 in Upper Gornal, Dudley
B4176	A459 in Dudley	A442 south of Telford
B4177	A459 in Dudley	A459/A461 junction in Blowers Green, Dudley
B4178	A449 in Wall Heath	A4101 west of Kingswinford Town Centre	Called Swindon Road along its entirety and runs for approximately half a mile
B4179	A4101 in Pensnett, West Midlands	A461 in Brierley Hill Town Centre
B4180	A491 in Wordsley, West Midlands	A461 in Brierley Hill	Eastern section of Brockmoor High Street is one way, traffic redirected along Hickman Road
B4182	A456 in Bearwood, West Midlands	B4170 in Langley Green, West Midlands
B4183	Halesowen Town Centre, West Midlands	A456 in Hayley Green, West Midlands
B4184	A441 in Redditch	Bromsgrove Town Centre
B4185	B4091 in Catshill, Worcestershire	A38 near Lydiate Ash, Worcestershire
B4186	A458 in Wollaston, West Midlands	A4036 just south of Lye
B4187	A491 in Stourbridge	A456 in Hagley, Worcestershire
B4188	A491 near Belbroughton, Worcestershire	A456 in Blakedown, Worcestershire
B4189	A449 near Kidderminster, Worcestershire	A442 near Kidderminster, Worcestershire	Bridges the River Severn north of Kidderminster
B4190	B4189 near Kidderminster, Worcestershire	A456 near Bewdley, Worcestershire	Crosses the River Severn at Bewdley
B4192	A419 at Swindon, Wiltshire	A4 in Hungerford, Berkshire
B4193	A449 near Hartlebury, Worcestershire	A4025 at Stourport, Worcestershire
B4194	B4196 at Areley Kings, Worcestershire	B4363 near Kinlet, Shropshire	Goes through Bewdley
B4195	B4190 at Bewdley, Worcestershire	A451 at Stourport, Worcestershire
B4196	A451 at Areley Kings, Worcestershire	A443 at Holt Heath, Worcestershire
B4197	A443 at Great Witley, Worcestershire	A44 at Knightwick, Worcestershire
B4199	B4194 near Kinlet, Shropshire	B4363 near Kinlet, Shropshire	1 mile long

4 digits (42xx)

Road	From	To	Notes
B4200	Wednesbury, West Midlands	A4038 near Darlaston, West Midlands	Originally (1922—1927) the route number for the A4117 in Shropshire
B4201	A4117 near Cleobury Mortimer, Shropshire	B4363 near Cleobury Mortimer, Shropshire
B4202	A443 at Abberley, Worcestershire	A4117 near Cleobury Mortimer, Shropshire
B4203	A443 at Great Witley, Worcestershire	A44 at Bromyard, Herefordshire
B4204	A443 at Worcester	A4112 at Tenbury Wells, Worcestershire
B4206	A443 at Worcester	A449 at Worcester
B4210	Walsall, West Midlands	A462 near Essington, Staffordshire
B4211	A4104 at Upton upon Severn, Worcestershire	A417 between Corse and Hartpury, Gloucestershire
B4214	A438 at Ledbury, Herefordshire	A4117 at Cleehill, Shropshire	28 miles long
B4217	Five Ways, Birmingham	A4040 Fox Hollies Road at Acocks Green, Birmingham	Route of the number 1 bus
B4221	B4215 at Newent	A40 at Ross-on-Wye
B4223	A4058 at Llwynypia	A4061 near Treorchy
B4230	A438 near Byford	A4112 near Weobley	By way of Mansell Gamage, Norton Canon and Weobley
B4233	Abergavenny	Monmouth	By way of Llanvapley and Rockfield
B4237	A48 at Newport	A48 at Newport	Now the former A48 route through Newport. The previous route, including Newport Transporter Bridge is now unclassified.
B4242	A4109 at Aberdulais	Pontneddfechan
B4245	A48 at Llandevaud	A48 at Caldicot
B4260	A40 near Bridstow	A40 near Hildersley, Ross-on-Wye
B4265	A4226 near Cardiff International Airport	A473 at Bridgend
B4271	A4118 near Upper Killay	B4295 at Llanrhidian
B4275	A4054 at Abercynon	A4059 at Penywaun	Originally the A4059 route.
B4278	A4093 near Gilfach Goch	A4058 near Dinas	This road originally ran through Dinas and Tonypandy but was upgraded to the A4058 route.
B4278	A4058 near Porth	A4233 near Stanleytown A4058 near Llwynypia	This road was originally the A4233 and A4058 but following the completion of the Porth Relief road these roads were downgraded.
B4280	A473 near Pencoed	A4061 at Bryncethin
B4282	A4017 at Cwmafan	A4063 at Cwmfelin
B4283	A48 near Groes, Port Talbot	A4229 at South Cornelly
B4284	Five Ways, Birmingham	B4124 in Edgbaston, Birmingham
B4286	A4241 at Port Talbot	B4287 at Pontrhydyfen
B4287	B4434 at Neath	A4107 at Pontrhydyfen
B4290	B4489 at Swansea railway station	A4067 at Victoria Park
B4290	A483 near Jersey Marine	A4230 at Neath Abbey
B4291	A48/A4230 near Peniel Green	B4603 at Clydach
B4295	A4216 at Cockett	B4271 at Llanrhidian	north Gower road
B4296	A4118 at Killay	A48 at Pontarddulais
B4297	A484 near Bynea	A4138 near Llangennech
B4298	A40 west of Carmarthen	B4299 at Meidrim
B4299	A4066 at St Clears	B4333 south of Newcastle Emlyn	by way of Trelech

4 digits (43xx)

Road	From	To	Notes
B4301	A484 at Bronwydd	A485 at Pontarsais
B4302	A483 near Llandeilo	A462 near Crugybar
B4303	A476 near Felinfoel	B4297 near Penceiliogi
B4304	A484/A4138 at Parc Trostre	A484 in Sandy, west Llanelli
B4304	A484 in central Llanelli	B4304 at Morfa
B4306	A4138 in Hendy	B4309 near Bancycapel
B4308	B4309 at Llanelli	A484 near Kidwelly
B4309	A484 in central Llanelli	A484 near Cwmffrwd
B4313	A487 in Fishguard, Pembrokeshire	Narberth, Pembrokeshire	Starts at Main St, Fishguard (A487), winds generally S or SE finishing in Narberth (junction with B4314), via Gwaun Valley, Llanychaer, crosses B4329 at Greenway, Rosebush, Maenclochog, crosses A40; approximately 21 miles.
B4314	A4066 in Pendine	A40 at Robeston Wathen
B4329	A487 W of Eglwyswrw	A40 at Haverfordwest	Crosses Preseli Mountains N to S, reaching 404 metres (1,325 ft); scenic views across south and west Wales
B4330	A487 in Haverfordwest	A487 at Croes-goch	Joins W-bound A487 to NE-bound A487
B4331	A40 at Letterston	A487 at Mathry
B4332	A487 at Eglwyswrw, Pembrokeshire	A484 at Cenarth, Carmarthenshire	Via Newchapel (Manordeifi) and Boncath; crosses A478 near Blaenffos
B4333	A487 at Aberporth Airport	A484 at Cynwyl Elfed	Via Aberporth, Beulah, Cwm-cou (Carmarthenshire) and Newcastle Emlyn
B4337	A487 at Llanrhystud, Ceredigion	B4302 near Llansawel, Carmarthenshire
B4355	A44 at Kington, Herefordshire	A483 at Dolfor, Powys	Crosses A488 at Knighton
B4356	Presteigne, Powys	A483 at Llanbister, Powys
B4357	A44 near Kington, Herefordshire	B4355 near Knighton, Powys
B4358	A483 at Beulah, Powys	A4081 near Llandrindod Wells, Powys
B4360	A44 at Leominster, Herefordshire	A4110
B4361	A49 at Ludlow, Shropshire	A49 at Leominster, Herefordshire
B4362	A49/A456 at Brimfield, Herefordshire	A44 near Kington, Herefordshire
B4363	A454 at Bridgnorth, Shropshire	A4117 at Cleobury Mortimer, Shropshire
B4364	Bridgnorth, Shropshire	A4117 near Ludlow, Shropshire
B4365	A49 at Ludlow, Shropshire	B4368 at Corfton, Shropshire	Crosses over the tracks of Ludlow Racecourse - traffic is stopped when course is in use
B4366	A4086 at Caernarfon	A4244 / B4547
B4367	B4368 near Craven Arms, Shropshire	A4113 at Bucknell, Shropshire
B4368	A458 near Bridgnorth, Shropshire	A483 at Abermule, Powys	Crosses A49 (at Craven Arms), A488 and A489
B4369	B4367 at Broome, Shropshire	B4368 at Aston on Clun, Shropshire	0.5 miles long
B4370	A49 at Marshbrook, Shropshire	A489 at Horderley, Shropshire	The northern section from Little Stretton to All Stretton was renumbered to B5477 in 2004
B4371	A458 at Much Wenlock, Shropshire	B5477 in Church Stretton town centre, Shropshire	Intersects with the A49 at Church Stretton
B4372	A44 at New Radnor, Powys	B4357
B4373	B5060 at Donnington, Telford, Shropshire	Bridgnorth, Shropshire	Goes through Ironbridge Gorge
B4375	B4373 at Broseley, Shropshire	B4376 near Much Wenlock, Shropshire
B4376	B4373 at Broseley, Shropshire	A458 at Much Wenlock, Shropshire
B4378	A458 at Much Wenlock, Shropshire	B4368 at Shipton, Shropshire
B4380	A4169 near Ironbridge, Shropshire	A5 at Montford Bridge, Shropshire	Passes through the south and west of Shrewsbury
B4381	A490/A458 at Welshpool, Powys	B4388 near Welshpool
B4382	B4389 near Llanfair Caereinion, Powys	B4393 near Lake Vyrnwy, Powys	Crosses A495
B4383	A488 near Bishop's Castle, Shropshire	A489 near Bishop's Castle, Shropshire	1 mile long
B4384	A488 at Bishop's Castle, Shropshire	B4385 at Bishop's Castle, Shropshire	Schoolhouse Lane; less than 0.5 miles long
B4385	A4113 at Leintwardine, Shropshire	A458 near Llanfair Caereinion	Passes through Montgomery, Powys; crosses A488, A489 and A483
B4386	A458/A488 at Shrewsbury	A483 at Abermule, Powys	26 miles long; crosses A5 and A490
B4387	A488 at Minsterley, Shropshire	A458 at Halfway House, Shropshire
B4388	Montgomery, Powys	A458 near Welshpool, Powys	Crosses A490
B4389	A495 near Llanfair Caereinion, Powys	A483 near Newtown, Powys	Crosses A458
B4390	A483 at Berriew, Powys	B4389
B4391	A490 near Llanfyllin, Powys	A494 at Bala, Gwynedd
B4392	A483 at Arddleen, Powys	A458 at Cyfronydd, Powys	Crosses A490
B4393	A458 at Ford, Shropshire	Lake Vyrnwy	Crosses A483 and A495; encircles Lake Vyrnwy
B4394	A442 at Wellington, Shropshire	B4380 at Wroxeter	Crosses A5
B4395	A458 at Llangadfan, Powys	B4393 near Lake Vyrnwy
B4396	A5 at Nesscliffe, Shropshire	B4393 near Lake Vyrnwy	Crosses A483 and A495
B4397	B4396 at Knockin, Shropshire	B5063 near Wem, Shropshire
B4398	B4396 at Knockin, Shropshire	B4393 Llansantffraid, Powys

4 digits (44xx)

Road	From	To	Notes
B4401	A5 at Corwen, Denbighshire	A494 near Bala, Gwynedd
B4402	A494	B4391
B4403	A494 at Llanuwchllyn, Gwynedd	B4391 near Bala, Gwynedd	Runs along the eastern side of Bala Lake
B4404	A489 at Cemmaes Road, Powys	A487 near Machynlleth, Powys
B4405	A487 at Minffordd, Gwynedd	A493 near Tywyn, Gwynedd
B4406	B4407 south west of Llyn Conwy, Gwynedd	A5 south east of Betws-y-Coed, Gwynedd	by way of Penmachno
B4407	B4391 near Ffestiniog, Gwynedd	A5 near Pentrefoelas, Gwynedd	by way of Ysbyty Ifan
B4410	A498 north of Prenteg	A487 near Maentwrog	Sarn Helen - crosses A4085 at Garreg
B4411	A487 at Glan-Dwyfach, Gwynedd	A497 at Criccieth, Gwynedd
B4416	A470 near Dolgellau, Gwynedd	A494 near Dolgellau, Gwynedd
B4418	A487 near Pen-y-Groes and Llanllyfni, Gwynedd	A4085 at Rhyd-Ddu, Gwynedd	by way of Nantlle
B4422	Bodorgran (Anglesey) with road A4080 [53.198809,-4.402857]	B5109 Llangefni Anglesey [53.258975,-4.326489]
B4425	A40 near Burford	A429 east of Cirencester	Formerly part of the A433
B4427	B4058 at Hambrook, South Gloucestershire	A38 at Rudgeway	Old Gloucester Road
B4429	A428 at Rugby	M45/A45 at Thurlaston
B4434	A474 in Neath	A465 at Resolven
B4436	A4118 near Langrove	A4067 at Blackpill
B4437	A44 near Wootton, Oxfordshire	A361 north of Burford	via Charlbury
B4438	A452 in Bickenhill, West Midlands	B4102 at Catherine-de-Barnes, West Midlands	Passes through Birmingham Airport
B4442	A404 at Little Chalfont	A413 at Chalfont St Giles
B4445	A418 at Thame	B4009 at Chinnor
B4449	B4044 at Eynsham, Oxfordshire	A4095 at Bampton
B4450	Chipping Norton, Oxfordshire	A436 east of Stow-on-the-Wold	via Bledington
B4451	B4100 at Gaydon, Warwickshire	A425 at Southam, Warwickshire
B4453	A445 in Leamington Spa, Warwickshire	A45 at Dunstore Heath near Rugby, Warwickshire
B4455	A429 near Halford, Warwickshire	A5 at High Cross, Leicestershire	Part of the Fosse Way (Roman road)
B4461	M48 at Aust	B4061 at Alveston
B4464	A454, near Willenhall, West Midlands	A454/M6 junction, Bentley, West Midlands	Former route of A454 through Willenhall Town Centre
B4465	A420 at Easton, Bristol	A46 near Tormarton	Passes through Chester Park, Staple Hill and Pucklechurch, ending near Junction 18 of the M4
B4466	A4 (Hotwells Road), Bristol	A4018 at Clifton, Bristol	Jacob's Wells Road
B4467	B3129 in Clifton, Bristol	A4176 at Clifton Down	Pembroke Road
B4468	A4018 at Durdham Down, Bristol	A38 at Horfield, Bristol	Coldharbour Road and Kellaway Avenue
B4469	A38 at Horfield, Bristol	A420 at St George, Bristol	Muller Road and Rose Green Road
B4473	A458 west of Shrewsbury	B4380 at Montford Bridge, Shropshire	1 mile long; crosses A5
B4483	B4163 in Coseley, West Midlands	A457 in Woodsetton, West Midlands
B4484	A460 in Fallings Park, Wolverhampton	Bilston Town Centre
B4485	A44 at Worcester	A4440 at Worcester
B4489	A483 at Swansea	A48 and the M4 at Junction 46
B4492	A4000 at Gypsy Corner, North Acton just north of the A40, Western Avenue	A4000 at Harlesden, just south of the A404	"Alternative" route through Park Royal via North Middlesex Hospital
B4493	A417 at Harwell, Oxfordshire	A4130 at Didcot, Oxfordshire
B4494	A4 at Newbury	Wantage
B4495	A4144 Abingdon Road, Oxford	A4165 Banbury Road, Summertown, Oxford	Passes through the east of Oxford, over Donnington Bridge, through Cowley and Headington, then Marston Ferry Road
B4499	A488 at Minsterley, Shropshire	B4386 at Brockton, Shropshire

4 digits (45xx)

Road	From	To	Notes
B4500	B5070 at Chirk, Wrexham	B4580 at Llanrhaeadr, Powys
B4501	A543 at Denbigh, Denbighshire	A4214 at Fron-Goch, Gwynedd	passes Llyn Brenig, Alwen Reservoir and crosses A5 at Cerrigydrudion
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-westerly 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.[2]
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
B4582	A487 at Llantood, north Pembrokeshire	A487 near Newport, Pembrokeshire	Via Glanrhyd and Nevern
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

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

References

1. Ordnance Survey map, 1949
2. http://www.cycling.visitwales.com/server.php?show=nav.2472