A roads in Zone 4 of the Great Britain numbering scheme

List of A roads in zone 4 in Great Britain starting north of the A4 and south/west of the A5 (roads beginning with 4).

Looking north up the A441 Alvechurch Bypass from the roundabout at the junction of the A441 and B4120 roads between Alvechurch and Bordesley, Worcestershire, England

The numbering zones for A-roads in Great Britain

Single- and double-digit roads

Road	From	To	Notes
A4	City of London (Holborn Circus)	Avonmouth	Originally London to Bath
A40	City of London (near St. Paul's Cathedral)	Fishguard	The longest A road in Zone 4 at 256 miles long
A41	Central London (near Marble Arch)	Birkenhead	A large section of the former A41, from Bicester to Solihull, was downgraded when the northern extension of the M40 motorway was opened, as was a section in Birmingham due to other road improvements; most of it is now the non-contiguous B4100. A41 rerouted along new dual carriageway, Black Country New Road, between West Bromwich and Wednesbury. Old route through Hill Top renumbered A4196.
A42	Kegworth	Appleby Magna	A continuation of the M42, hence the use of A42 despite being entirely in Zone 5. Previously allocated to a road from Reading to Birmingham; this became part of the A329, the A423 (this section now the A4074 and A4158), and the A34 (section from Oxford to the M42 is now the A4144, A44, A3400).
A43	M40 motorway Junction 10 north of Bicester	Stamford	Formerly continued along present route of B430.
A44	Oxford	Aberystwyth	Officially the most dangerous road in Wales between Aberystwyth and Llangurig.[1] Route between Evesham and A422 originally designated A4538.
A45	Birmingham	Thrapston	Previously continued along route of current A14 to Felixstowe
A46	Bath	Cleethorpes	The section from Cheltenham to Heath End (North of Stratford on Avon) was mostly reclassified as B4632 and much of what was previously the A435 from Cheltenham to Bidford was renamed the A46. A piece of A438 from M5 J9 to Teddington also became part of the A46.
A47	Birmingham	Lowestoft	The original section between Birmingham and Nuneaton has mostly been now de-classified to B-roads, while the section between Nuneaton and Leicester via Hinckley has been largely de-trunked since the M69 runs a similar route. A12 from Great Yarmouth to Lowestoft redesignated as A47 in 2017.
A48	Highnam near Gloucester	Carmarthen	Originally began in Worcester. Worcester to Newport is now A449.
A49	Ross-on-Wye	Bamber Bridge

Triple-digit roads

Only roads that have individual articles have been linked in the "Road" column below.

Road	From	To	Notes
A400	Central London (Trafalgar Square)	Archway	Takes the route of the Northern line, Charing Cross Branch and High Barnet Branch
A401	Central London (Piccadilly Circus)	Angel
A402	Central London (Marble Arch)	Stamford Brook, Chiswick
A403	M48 motorway, J1 near Aust	Avonmouth	A road of the same number ran down Western Avenue, London until 1946 when the A40 was diverted along the route.
A404	Central London (Edgware Road station)	A404(M) Junction 9B near Maidenhead	The London section is called Harrow Road for most of its length. Originally ran through Pinner, but now by-passes it using parts of the old A410 and A4090 and the old route through Pinner has now been declassified
A405	Leavesden Green	Near Park Street
A406	Gunnersbury	Beckton	The North Circular Road
A407	Harlesden	Child's Hill	Through Willesden including the High Road and Cricklewood
A408	Heathrow Airport	Uxbridge	The southern section in Sipson due to be demolished to make way for Heathrow Airport 3rd runway
A409	Northwick Park Hospital	Bushey	through the middle of Wealdstone and the western part of Stanmore known as Stanmore Common
A410	Pinner	Edgware	Uxbridge Road, through Stanmore Broadway, then London Road and Spur Road meeting the A41. Original western section now part of A404
A411	Watford	Barnet	Meets the A41 twice between which it goes through the centre of Watford, Bushey Arches and Bushey Heath, then through the northern part of Elstree, across Stirling Corner through Arkley and into Barnet
A412	Slough	Garston
A413	Gerrards Cross	Towcester
A414	Near Hemel Hempstead	Maldon	Section from Hemel Hempstead to the Park Street Roundabout was the M10 before 2009.
A415	Berinsfield	Witney
A416	Amersham	Berkhamsted
A417	Streatley	Leominster
A418	M40 motorway J8a	Ascott, Buckinghamshire
A419	Whitminster	Swindon
A420	Bristol	Oxford
A421	Croughton	Wyboston	Forms the H8 Standing Way in Milton Keynes.
A422	Bedford	Worcester	Concurrent with the A46 between Stratford-upon-Avon and Alcester. Forms the H3 Monks Way in Milton Keynes.
A423	Hinksey Hill	Coventry	Formerly ran from Maidenhead to Tamworth via Oxford and Banbury and Coventry, and a small section of this remains as part of the Oxford Ring Road. Now begins its former route at Banbury. Section beyond Coventry now B4098 and A51.
A424	Burford	A44 near Bourton-on-the-Hill
A425	Daventry	Warwick	Route between the junctions with the A452 and the A46 previously part of A41.
A426	Leicester	Southam
A427	Market Harborough	Oundle
A428	Coventry	Cambridge	This road is now split in two parts between Great Barford and Eaton Socon due to the extension of the A421 to the A1.
A429	Chippenham	Coventry
A430	Quedgeley	Longford, Gloucester	Canal in Gloucester realigned in 2006 as part of A430 Western Relief Road construction.
A431	Bristol	Bath
A432	Bristol	Old Sodbury
A433	A46 at Dunkirk	A429 SW of Cirencester
A434	Unused		Used to run from the A429 near Malmesbury to the A38 near Hardwicke, south of Gloucester. Malmesbury–Nailsworth section now B4014; section north of Stroud became part of A419, now part of B4008.
A435	Birmingham	Cirencester	Concurrent with the A46 between Alcester and Teddington Hands
A436	A417 near Brockworth	A44 near Salford, Oxfordshire
A437	Harlington, London	A40 Western Avenue near Ickenham	Originally Gloucester to Newport, now A48.
A438	M5 motorway Junction 9	A470 near Llanfilo
A439	Stratford-upon-Avon	A46 4 miles SW of Warwick
A440	Reserved		Reserved for Bristol Road. Used to run from Pershore to Great Malvern (now B4211 and A4104). Crossed River Severn on swingbridge (demolished 1940) in Upton-upon-Severn.
A441	Birmingham	Cookhill	Previously continued along present alignment of B4088.
A442	Droitwich	Whitchurch
A443	Worcester	Newnham Bridge
A444	Coventry	Burton upon Trent	Short gap in Coventry due to incomplete construction of Phoenix Way.
A445	Warwick	A45 at Ryton-on-Dunsmore
A446	Little Packington	Roughley
A447	Hinckley	Coalville	The original route through Hinckley was by-passed by a new road completed in the early 1990s
A448	Kidderminster	Studley, Warwickshire	The original route between Bromsgrove and Redditch was by-passed by a dual carriageway in the 1970s after Redditch was developed into a new town
A449	Newport	Stafford	Used to continue beyond M4. Route to M5 motorway previously A4538.
A450	Torton	West Hagley	Originally continued along present alignment of B4187.
A451	Stourbridge	Great Witley
A452	Leamington Spa	Brownhills	Known as Chester Road for most of route between A5 and M42. Link road between A425 and M40 J14 previously A41.
A453	Nottingham	Birmingham (Perry Barr)	Concurrent with A5127 (former A38) in Sutton Coldfield. Part of old route reinstated as A453 to serve East Midlands Airport.
A454	Bridgnorth	Four Oaks	The section through Willenhall was renumbered in the 1970s following the completion of The Keyway by-passing the south of the town, and further reumbering took place in 1995 on the completion of the Black Country Route. Used to continue direct to Bridgnorth town centre. Rerouted along new alignment to meet A458 near Stanmore when bypass opened.
A455	Unused		Used to run from M4 junction 24 in Ringland, Newport to George Street Bridge. Now part of the A48 Southern Distributor Road and rest is now Corporation Road. The original A455 ran from Birmingham to Stafford until 1935 when it became part of an extension to the A34.
A456	Birmingham	Woofferton	The section through Halesowen was renumbered to B4183 and A458 when the by-pass opened in the 1960s. Originally started on A41 in city centre, it later started on the Inner Ring Road but now starts on the Middle Ring Road (A4540).
A457	Birmingham	Sedgley	The original route through Smethwick town centre was renumbered when a by-pass opened in about 1970. Also used to pass through Oldbury town centre. Has two branches in Sedgley: Tipton Road and Gate Street.
A458	Mallwyd	Quinton	Originally started in Cross Foxes Inn. Further renumberings have taken place over the years, notably when the town of Bridgnorth was by-passed in 1985, and when the western section became part of the A470. Section between Halesowen and Quinton previously A456.
A459	Halesowen	Wolverhampton	Renumbering took place when Dudley town centre was by-passed by a new route of the A461 in 1999. The road continued south of Halesowen towards Bromsgrove until the 1970s. Also used to meet Ring Road in Wolverhampton but now terminates at A4123, Grove Street. Until the 1960s ran down Dudley Street in Wolverhampton. After this road was pedestrianised, followed route of B4158, B4160 and part of A460 via Garrick Street, Market Street, Princess Street and Stafford Street to Five Ways. However Stafford Street was taken over by the A449 when old A449, Waterloo Road, declassified in 1980s.
A460	Wolverhampton	Rugeley	The section through the centre of Cannock was renumbered A4601 in 1989 when the town's by-pass opened. Currently only link to M6 North from M54 Junction 1. Originally terminated in Princes Square in Wolverhampton.
A461	Lichfield	Wollaston, West Midlands	Concurrent with the A41 between Wednesbury & Great Bridge. Previously passed through Brierley Hill town centre. Old route through Dudley town centre renumbered or declassified when bypass opened in 1999. In 2008, the bypass was named Duncan Edwards Way.
A462	Essington	Wednesbury	The section through Darlaston town centre became unclassified when a new by-pass opened in the late 1960s
A463	Wombourne	Willenhall	The section beyond Coseley was either renumbered or became unclassified when the Black Country Route was completed between 1986 and 1995. Part of former route in Bilston replaced by A4039 and B4484. Concurrent with A454 between The Keyway and Armstrong Way.
A464	Oaken	Hollinswood	Primary route between Wolverhampton and Telford for non-motorway vehicles via Albrighton and Shifnal
A465	Bromyard	M4 motorway Junction 45, Llandarcy
A466	King's Thorn	Chepstow
A467	Duffryn, Newport	A465, Brynmawr
A468	Bassaleg, Newport	A470, Nantgarw
A469	A4161, Roath, Cardiff	A465, Rhymney
A470	Cardiff	Llandudno	Original north end was at Brecon. Later extended north.
A471	Unused		Ran from Abergavenny to Usk. In 1935 the section from Abergavenny to Llanvihangel Gobion became part of a rerouted A40 and the remainder was downgraded to the B4598 in the 1970s.
A472	Treharris	Usk
A473	Pontypridd	Bridgend	Originally started at Treforest but following the completion of the Church Village bypass it now starts at Upper Boat and the section between Treforest and Gwaun Meisgyn is now downgraded to the B4595.
A474	Briton Ferry	Ammanford
A475	Newcastle Emlyn	Lampeter
A476	Llanelli	Llandeilo
A477	St Clears	Johnston
A478	Cardigan	Tenby
A479	Glanusk	Llyswen	Runs through the heart of the Brecon Beacons in Wales. Originally went northwest to Rhayader, but this section became part of the A470. Another A479 runs along Empire Way, Wembley (North West of London); this was formerly B4565 until 2007.
A480	A44 at Lyonshall	A438 west of Hereford
A481	Somewhere near Llanfihangel, Llandegley	Llanelwedd
A482	Aberaeron	Llanwrda
A483	Swansea	Chester	by way of Wrexham. Becomes A5 road in the vicinity of Oswestry.
A484	Cardigan	Cadle near Swansea	by way of Newcastle Emlyn, Carmarthen and Llanelli
A485	Tanerdy	Llanfarian
A486	New Quay	A484 near Saron
A487	Haverfordwest	Bangor
A488	Penybont	Shrewsbury
A489	Craven Arms	Machynlleth
A490	Churchstoke	Llanfyllin
A491	Lydiate Ash	Wall Heath	Used to terminate in Bromsgrove.
A492	Unused		Used to run from Llangurig to Newtown (now A470 and A489).
A493	Machynlleth	Dolgellau	Via Tywyn
A494	Queensferry	Dolgellau	Extension to M56 motorway opened late 2008.
A495	A525 west of Whitchurch	A5 outside Oswestry	Previously met A483 closer to Oswestry, now truncated by Oswestry bypass.
A496	Llanelltyd	Blaenau Ffestiniog	Via Barmouth; originally went north to Llandudno (this became part of the A470).
A497	Porthmadog	Nefyn
A498	Pen-y-Gwryd	Porthmadog
A499	A487	Abersoch

Four-digit roads (40xx)

Road	From	To	Notes
A4000	A406 in Acton Town	A404 in Harlesden	Originally began at the A4 in Chiswick (this section is now part of the A406) and originally ended at the A407 (this section is now unclassified).
A4001	Hanwell	Hanwell	Still signed, but may not exist because it and the A3002 form a one way pair.
A4002	Unused		Was the Tubbs Road / Nightingale Road one-way system in Harlesden, now unclassified.
A4003	Brondesbury	Willesden	Willesden Lane
A4004	Unused		Was a road in Harlesden from the A407 to the A404 (now part of the A407 and the old A407 is now Craven Park, an unusual road name).
A4005	West London (Hanger Lane Gyratory)	Roxeth
A4006	Harrow	West Hendon	Also known as Kenton Road and Kingsbury Road
A4007	Iver Heath	Uxbridge
A4008	Hatch End	Watford	Originally ran from Hurley to Temple, cutting the corner between what was then the A415 (later A423, now A4130) and A416 (now A404). Renumbered as a spur of the A423 in 1935, but has since been declassified after dualling of the A404 and downgrading of the A423 to A4130.
A4009	Unused		Ran from the A32 (now A4155) in Caversham to the A415 (now A423) in Nettlebed. Downgraded to a southern extension of the B481.
A4010	High Wycombe	Aylesbury
A4011	Unused		Ran from the A413 in Wendover to the A41 in Aston Clinton. Downgraded to an extension of the B4009 after the towns it connected were bypassed.
A4012	Hockliffe	A4146
A4013	Kingsditch	Benhall	Originally a link road in Aylesbury; became a portion of the A41, but is now declassified. A portion of the route is now gone, with a shopping center built on top.
A4014	Unused		Ran along Gravel Walk from the A417 to the A420 (now B4019) in Faringdon; this became part of a rerouted A417, while the old route of the A417 is now an extended A4095, London Street, and Stanford Road.
A4015	Cheltenham	Cheltenham	Originally ran along Kings Hill Road and Bath Road in Swindon, linking the A361 to the A420. Renumbered to the A4289; was possibly the B4006 before this.
A4016	Unused		Ran along St. James Parade, Monmouth Street and Monmouth Place in Bath. When the A4 was extended in 1935, the A4016 became entirely in Zone 3 and was renumbered as a spur of the A367. The central section was declassified after WWII. May have been used in Cheltenham along the former route of the A46; number is not shown on maps but does appear in a DfT road list from around 2002. A 1972 OS map indicates that this version of the A4016 dates from the late 1960s or early 1970s, possibly before construction of the M5 through the town. The route through the town center is now unclassified, Lower Winchcombe Street returned to the A46, Upper Winchcombe Street is now part of the A435, and the remainder is now the B4632.
A4017	Kingswood	A4174 at Bromley Heath	Soundwell Road
A4018	Bristol	Cribbs Causeway
A4019	Coombe Hill	Cheltenham
A4020	Shepherd's Bush	Denham	Known as the Uxbridge Road for most of its length (with short stretches known by other names). Follows the former route of the A40. Originally ran from Beeches Green to Cairnscross. Became a portion of the A419 in 1935 when it was rerouted.
A4021	Unused		Ran from A440 (now B4211) in Rhydd to Powick (became the B4424 at the same time the A440 became the B4211).
A4022	Unused		Ran from A441 to A448 in Redditch via Plymouth Road.
A4023	Redditch	Matchborough	Used to run from Redditch to Coventry but nearly all the section has been downgraded to the B4101 upon completion of the M42 in 1986.
A4024	Unused		Ran from A448 (now B4184) in Aston Fields to A38 (now B4094) Stoke Heath. mostly became part of the A38 when the eastern bypass was complete, rest is now Stoke Road.
A4025	Stourport-on-Severn	A449
A4026	Shenstone	Little Aston	Known as Little Aston Lane. Has a weight limit imposed in a northerly direction only. Unsigned from A454.
A4027	Unused		Ran from A47 to A41 in Birmingham. Absorbed into the A4400 and is now part of the B4100.
A4028	Unused		Ran from the A38 and A455 to the A47 in Birmingham. Absorbed into the A4400 and now part of the B4100 (or B4114).
A4029	Edgbaston	Edgbaston	Pebble Mill Road, dual carriageway, formerly home to the BBC Pebble Mill Studios.
A4030	Bearwood	Smethwick	From around 1930 to the mid-1960s, this road continued along the route of the present A4040 to the A441 just north of Kings Norton.
A4031	Smethwick	Walsall
A4032	Bristol	Bristol	Continuation of the M32 to the A4044 inner ring road. Originally ran along Park Road in Hagley; declassified when the A491 bypass was built.
A4033	A4123 near Dudley	Oldbury	Previously also met A461 at Burnt Tree Island, Dudley. When the island was removed and replaced with the current traffic light junction, the A4033 was rerouted to a separate junction with the A4123.
A4034	Quinton	West Bromwich
A4035	Unused		Used to run from West Bromwich to Great Bridge where it joined the A461 towards Dudley. This road was downgraded to an unclassified road (Great Bridge Street) upon the completion of the Black Country Spine Road in 1995.
A4036	Dudley	Pedmore
A4037	Wednesbury	Dudley	Leabrook Road, Great Bridge to Wednesbury formerly A461.
A4038	Walsall	Moxley
A4039	Bilston	Penn, West Midlands	Short extension in Bilston along former A463 alignment (Coseley Road).
A4040			Birmingham Outer ring road. Most of route covered by Outer Circle bus service 11. The section from the A456 in Bearwood to the A38 in Selly Oak was originally numbered B4123. In the 1930s the road beyond Harborne (current end of the A4123) was upgraded to form part of the A4123 (which continued to the A441 north of Kings Norton) before becoming the A4030. It was designated A4040 in the 1960s. As part of the Selly Oak "triangle" development, the former Eastbound carriageway (Chapel Lane) was renumbered B3800 as Harborne Lane was dualled. Originally ran from Wall Heath to Kidderminster which became a portion of the A449 in 1935.
A4041	West Bromwich	Streetly	Originally ran east of Kidderminster, bypassing the town. Became a portion of the A449 in 1935.
A4042	Abergavenny	A48, Newport
A4043	Blaenavon B4246	Pontypool, A472
A4044	Redcliffe, Bristol	St James Barton, Bristol	Bristol Inner Circuit: Redcliffe Way, Temple Way, Bond Street Originally ran from Crumlin to Brynmawr. Renumbered as a northern extension of the A467 in 1935.
A4045	Unused		Ran from Blaina Road to the A465 (now A4047) in Brynmawr. Now the B4248. Number later used for Victoria and Newmarket streets between the A438 and A49 in Hereford. Became the A438 and A49 due to pedestrianization in Hereford.
A4046	A465, Rassau	A467, Aberbeeg
A4047	A4048, Tredegar	A465, Brynmawr	Originally ran from Ebbw Vale to Waun-y-Pound; now a spur of the A4046.
A4048	A467, Crosskeys	A465, Tredegar
A4049	A4048, Pontllanfraith	A469, New Tredegar
A4050	A4232, Culverhouse Cross, Cardiff	A4055, Barry	Originally ran from Pengam to Tir-Phil; renumbered as a northern extension of the A469 in 1935.
A4051	Newport	North Cwmbran	Originally ran along Dyvenor Street in Merthyr Tydfil.
A4052	Unused		First used on a short section of old A40 along Blue Street in Carmarthen (the remainder became the A4116). Declassified due to town center development. Also used in Newport linking the A48 to the docks near Watch House Parade. Later renumbered as an extension of the A4042 and has since been declassified; the completion of the A4042/A48 rendered the route redundant.
A4053			Coventry Inner Ring Road Originally ran across the southern side of Cardiff city center from the A48 to the A4055. Later renumbered as an extension of the A4055 and is now part of the A4160 after the A4055 was rerouted.
A4054	A4119, Llandaff, Cardiff	A470, Cefn-Coed-y-Cymmer
A4055	A4232, Cardiff Bay, Cardiff	Barry Island, Barry
A4056	Unused		Ran from the A48 in Ely to the A470; now part of the A48. Was planned to be replaced by the A48(M) Llantrisant Radial, but this was never built.
A4057	Unused		Ran along Bedwas road in Caerphilly, cutting the corner between the A468 and A469. It became a spur of the A469 in 1935 and is now part of the B4600. Number later used in the late 1970s for the Droitwich Spa bypass; became a portion of the A38 in the early 1980s.
A4058	A470, Pontypridd	A4061, Treorchy	Originally started at Glyntaff but the sections between Glyntaff, Treforest and Pontypridd was downgraded to the B4595 following the completion of the Church Village bypass. This road originally ran through the village of Trealaw but following the completion of the Rhondda by-pass the section between Porth and Llwynypia was downgraded to the B4278 and the road now runs through the village of Dinas where the B4278 originally ran and also the former part of the A4119 near Llwynypia.
A4059	A470, Abercynon	A470, Between Brecon and Cefn-Coed-y-Cymmer
A4060	A470, Pentrebach	A465, Dowlais Top	Originally ran along Market Street (the 1922 Draft Road Lists claim Wyndham Street) from the then-A48 to the A4061 in Bridgend. Made redundant by completion of the A4061 and is now part of the pedestrianized area in Bridgend town center.
A4061	Bridgend	Hirwaun
A4062	Unused		Ran along Wigan Terrace between the A4061 and A4065 in Glamorgan. Became a branch of the A4065 in 1935; declassified after 1989 when the A4065 was rerouted. Number later used between the A40 and A438 near Brecon as an upgrading of the B4557. Downgraded to the B4602 except for the southern end, which is unclassified.
A4063	Bridgend	Cymmer
A4064	Sarn	Blaengarw
A4065	Tondu	Brynmenyn
A4066	St Clears	Pendine	Via Llanmiloe and Laugharne Originally ran from Hirwaun to Brecon Beacons. Renumbered as an extension of the A4059 in 1935.
A4067	West Cross, Swansea	Sennybridge
A4068	Gurnos	Brynamman	Originally ran along part of the Swansea Valley from Morriston to Ystalyfera. Renumbered as a northern extension of the A4067 in 1935; much of the route is now the B4603 except the northernmost section which is unclassified. Another portion was closed and abandoned altogether following a landslide in 1965.
A4069	Llandovery	Gwaun-Cae-Gurwen	Originally ran along Castle Street and Wind Street in Swansea. Renumbered as a portion of the A483 in 1935 and is now part of the B4489.
A4070	Unused		Ran from the A483 in Fforestfach to the A484 east of Loughor Bridge. Reclassified in the 1990s as the B4620 due to construction of a new approach road to Loughor Bridge (now the A484).
A4071	Dunsmore Heath	Rugby	Originally ran between the then-A40 and A474 in Llandelio. Now unclassified.
A4072	Unused		First used in 1922 south of Narberth between the A40 and A478. After the A40 was rerouted in the late 1920s, the A4072 was downgraded to an extension of the B3415 as it no longer met a Class I road at its eastern end. Used again in 1935 from A468 at Tredegar Park to A467 (now B4591) at Rogerstone after the B4242 and B4243 were upgraded to Class I status. The southern section became part of the A467 in 1983 and the remainder was declassified.
A4073	Unused		Originally ran between the A40 and A478 east of Narberth. After the A40 was rerouted in the late 1920s, the A4073 no longer had a Class I road to start from and was downgraded to a spur of the B4314. Used again in 1935, cutting the corner between the A438 and A479 in Llyswen and was the B4344 before it was upgraded to Class I status. Now part of the A470.
A4074	Iffley	Caversham	Links Reading with Oxford Originally ran between Narberth and Narberth Castle along High Street. When the A40 was rerouted in the late 1920s, the A4074 was downgraded to Class II status as the B4313, but is now part of the A478 one-way system.
A4075	Canaston Bridge	Pembroke
A4076	Haverfordwest	Milford Haven
A4077	Crickhowell	Gilwern & Govilon
A4078	Talgarth	Three Cocks
A4079	Three Cocks	Llyswen
A4080	Menai Bridge	A55	Originally ran between Llanwrda and Abermorlain. Renumbered as a portion of the A483 in 1935, but became part of the A40 after World War II.
A4081	Llandrindod Wells	Newbridge-on-Wye
A4082	Whitley, Coventry	Binley, Coventry	Called Allard Way between B4110 and A428. The section between Whitley and the B4110 was originally part of the A423. The A4082 was previously the designated number for a short stretch of the current A4081 in Llandrindod Wells (Ithon Road and Spa Road).
A4083	Unused		Ran from the A5 southeast of Oswestry to A483 in Oswestry. Became the A5 and B4579 due to completion of the A483 Oswestry bypass and rerouting of the A5.
A4084	Unused		Originally ran from Mallwyd to Dolgallau. Became a portion of the A458 in 1935 when it was extended west and is now part of the A470 after it was extended north in the 1970s. Next used in 1935 from the A489 near Cemmaes to Mallwyd on an old section of the A491 (the remainder became the A458, which ironically replaced the original A4084). Became a portion of the A470 in the 1970s after it was extended.
A4085	Minffordd	Caernarfon	The current route was formerly A487 before it swapped numbers. First used from the A44 in Llangurig to the A492 east of town, forming one side of a triangle. Became a spur of the A492 in 1935, but after the A492 was declassified and closed in the 1980s, the route became part of the A470. Next used in 1935 from the A489 in Tremadog to the A499 in Llanwrda; this was originally the B4410 before it was upgraded to Class I status. Became a part of the A487 in the 1960s after it swapped numbers; the old route of the A487 is now the current A4085.
A4086	Capel Curig	Caernarfon
A4087	Bangor	Bangor	Originally ran from the A5 at the south side of the Menai Suspension Bridge to the A499 near Capel-y-Graig. Became a portion of the A487 when it was extended north to the A5.
A4088	Willesden	Sudbury, London
A4089	Alperton	Wembley Park
A4090	Wembley	North Harrow	Used to run beyond North Harrow along George V Avenue to Hatch End, but this became part of the A404 in the 1980s. Originally ran from the A404 to the A416 in Amersham. Became a spur of the A404 in 1935 and is now part of the A4154.
A4091	Tamworth	Wishaw
A4092	Tonyrefail	Llangeinor
A4092	Bearwood	Cape Hill	Duplicate number. Connects A457 to A4030.
A4093	Rhondda	Llangeinor
A4094	Loudwater	Maidenhead
A4095	Faringdon	Bicester
A4096	Unused		Ran from A38 in Claypits to A419 (now Bath Road, Alkerton Road and Spring Hill); section east to Stonehouse became part of the A419 when the M5 was built, while the old route of the A419 became the B4008.
A4097	Minworth	Kingsbury	The current A4097 was originally mostly unclassified except for the part between Minworth and A446 which originally formed part of the B4141 (which briefly started at Salford Circus) before the section now part of the A38 became the A4097. The B4141 was then extended to the A423 (now A51) near Kingsbury. Upon completion of the Sutton Coldfield bypass, the A38 took over the route of the A4097 and the B4141 was then upgraded to the A4097 as it is today.
A4098	Moxley	Wednesbury
A4099	Halesowen	Blackheath

Four-digit roads (41xx)

Road	From	To	Notes
A4100	Blackheath	Brierley Hill
A4101	Kingswinford	Dudley	Section from Scotts Green Island to Dudley town centre previously A461. Between 1922 and 1925 this route was numbered B4177.
A4102	Amblecote		Duplicate number. Amblecote A4102 is one way street running between A461 and A491.
	Merthyr Tydfil	Merthyr Tydfil
A4103	Worcester	Hereford
A4104	A449 in Little Malvern	A44 Pershore	Upton-upon-Severn to Pershore originally part of A440. The section heading north from Pershore town centre was previously part of the B4082.
A4105			The original A4105 is now the B4218 in Malvern but was originally the B4217. A later A4105 formed a short link between the A49 and A456 in Brimfield Herefordshire, having previously been upgraded from unclassified to the B4528. Classified to A road status in 1971, it was declassified a few years later when the Brimfield bypass opened.
A4106	Bridgend	Porthcawl
A4107	Bwlch y Clawdd	Port Talbot
A4108			First used in the mid-1920s from Cymer to Glyncorrwg when the B4185 was upgraded to Class I status. This became an extension of the A4063 in 1935 when the A4107 replaced the A4063 west of Cymer and has since been declassified. The second A4108 ran from Gelilydan to Congl-y-wal, created around 1947 when the B4408 was upgraded to Class I status. Later became part of the A470 to create a north-south cross-country route through Wales.
A4109	Aberdulais	Glynneath
A4110	Leintwardine	Hereford
A4111	Near Whitney-on-Wye	Kington
A4112	Tenbury Wells	Eardisley
A4113	Bromfield	Knighton
A4114	Allesley	Willenhall	Previously part of the A45 before it was re-routed to run south of Coventry. Originally ran from Bladon Road to Oxford Road in Woodstock; this was part of the B4024 before it was upgraded in 1922 (the remainder was renumbered A4095). Became a spur of the A4095 in 1935 and was declassified by the 1950s.
A4115	Templeton	Cross Hands	Was B4315 until 1935. Originally ran from Aberaeton to Lampeter; this was previously the B4340 before it was upgraded in the mid-1920s. Became part of a rerouted A482 in 1935.
A4116			This was used for the original route of the A40 in Carmarthen when the Inner Relief Road opened and the A40 was rerouted along Morfa Lane. Due to the narrowness of the old A40 route, the A4116 was later declassified. First used between Stroud and Cirencester, designated in the mid-1920s when the B4069 was upgraded. Became part of a rerouted A419 in 1935.
A4117	Near Bewdley	Ludlow	Passes Titterstone Clee Hill at 381 metres above sea level.
A4118	Dyfatty Street, Swansea	Port Eynon
A4119	Tonypandy	Cardiff Bay	Originally began at Llwynypia but following the completion of the Porth Relief road the road became part of the A4058 Treorchy to Pontypridd route.
A4120	Llanbadarn Fawr, Aberystwyth	Ponterwyd	It runs parallel with the A44, but on the other side of the Rheidol Valley.
A4121			This was used for a short road in Wednesbury which ran along High Bullen from the A461 High Street to the A462 Upper High Street. It was classified in 1926 and was declassified some time later, possibly when the A461 was rerouted although this is uncertain.
A4122			Cut the corner between the A425 and A423 south of Southam, designated in 1927. Unlike other short link roads, the A4122 did not become a spur in 1935, but kept its number. Now part of the A425 itself.
A4123	Wolverhampton	Harborne (Birmingham)	The road continued from the current terminus in Harborne to the A441 just north of Kings Norton along the current route of the A4040 from the 1930s to the 1960s.
A4124	Wolverhampton	Brownhills	Wednesfield town centre bypassed in 2000s. Former route between Wood End Road and Wednesfield High School renumbered B4484. The A4124 ran only between Wolverhampton and Bloxwich from 1928 to the 1980s but the entire route was originally numbered B4155.
A4125	Northwood	Bushey	Originally ran from Little Mill to Abergavenny; this was the B4245 until the late 1920s. Renumbered as a northern extension of the A4042 in 1935.
A4126	Monmore Green	Coseley	Called Rookery Road between A4123 and A463. Not signposted off A463.
A4127	Heston	Wembley
A4128	High Wycombe	Great Missenden
A4129	Princes Risborough	Thame
A4130	Burchetts Green	Rowstock	The section of road between Milton Hill and Rowstock was formerly part of the A34.
A4131			Previously the road from the A47 at Camp Hill near Nuneaton to the original A5 in Atherstone. Now partly the B4111 and declassified.
A4132	Unused
A4133	Great Witley	Droitwich Spa
A4134			Ran from the A439 in Evesham Place to the A34 in Stratford-upon-Avon; was the B4534 before it was upgraded to Class I status in the 1970s. Now the northern portion of the A4390.
A4135	Tetbury	Slimbridge	The road was originally numbered B4066 and ended on the A38 in Cambridge, Gloucestershire. It was upgraded to A-road status around 1930. During construction of the M5 motorway, the road was rerouted to its present terminus in Slimbridge.
A4136	Huntley, Gloucestershire	Monmouth	Both ends link to A40 – goes through Forest of Dean
A4137	Whitchurch	Harewood, Herefordshire
A4138	Pontardulais	Llanelli
A4139	Tenby	Pembroke Dock
A4140	Wembley	Bushey Heath	Salmon Street, Fryent Way, Honeypot Lane, Marsh Lane. North of Stanmore Broadway as Stanmore Hill and The Common.
A4141	Solihull (M42 J5)	A4177 at Five Ways, Warwickshire	Previously part of A41; section renumbered when an extension of the M40 motorway opened. The southern end of the road lies midway between Knowle and Warwick. Originally the southwestern portion of the Oxford Ring Road, from Botley to South Hinksey. Extended along the old A40 in the 1930s when it was moved to the Oxford northern bypass. The bypass was extended north around 1960, allowing the A34 to take over the southern extension of the A4141. The remainder later became the B4044.
A4142	Heyford Hill, Oxford	Headington	Part of the Oxford Ring Road
A4143	Llanfoist	Abergavenny
A4144	Pear Tree, Oxford	Redbridge Park and Ride
A4145	Watford	Rickmansworth
A4146	Milton Keynes	Hemel Hempstead	Section between Leighton Buzzard and Hemel Hempstead downgraded to B440 in 2017. Only a small stretch connecting the A414 and A4251 remains as the A4146 in Hemel Hempstead. Forms much of H10 Bletcham Way, V11 Tongwell Street and a small portion of H6 Childs Way in Milton Keynes.
A4147	Hemel Hempstead	St Albans
A4148	Bescot	Bescot	Walsall Ring Road
A4149
A4150			Wolverhampton Ring Road Originally the northern section of the Gloucester Ring Road. Later switched to a section of leftover A40 in the center of Gloucester (the ring road was renumbered to A40); became a portion of the A417 by 1946 and is now unclassified and partially pedestrianized.
A4151	A48 at Elton, Gloucestershire	A4136 at Nailbridge	Through the Forest of Dean, main town on this road is Cinderford
A4152			Ran from the A40 to the A4149 in Ross-on-Wye; now declassified, possibly when all Class I roads were removed from the town center following completion of the A40 eastern bypass.
A4153			Ran from the A438 on the River Wye to the A438 just north of the Whitney Bridge; originally the B4350. Now part of a rerouted A438.
A4154	Amersham	Amersham on the Hill	Originally ran from Ledbury to Ridgeway Cross; north of Ledbury was the southern end of the B4214 and the section from there via Bosbury to Westfield was the B4128. Downgraded by the 1970s; the B4214 got its section back while the remainder is now the B4220.
A4155	Bourne End	Reading	By way of Little Marlow, Marlow, Medmenham, Henley-on-Thames, Lower Shiplake and Caversham
A4156	Aylesbury	Aylesbury	Part of Oxford Road, connects A413 and A418.
A4157	Aylesbury	Quarrendon	Aylesbury outer ring road
A4158	Oxford	Iffley
A4159	Bow Street, Aberystwyth	A44	Acts as a by-pass around the northern part of Aberystwyth.
A4160	Newport Road, Cardiff	Llandough	Former A4055 and B4260. Number previously reserved in 1935 for upgrading the B489 to form a Swindon-East Anglia route with the A5160 (proposed to be used instead of the A505 for the A505/A601 route for number continuity). But the tonnage was not enough (and it was never going to be) to upgrade the road to Class I, so this proposal fell through and the route remains the B489.
A4161	Ely Bridge, Cardiff	Southern Way, Cardiff	Runs along a part of the old A48.
A4162	A4 at Sea Mills	A4018 at Westbury-on-Trym	Sylvan Way and Canford Lane
A4163			Was reserved for Courtlands Drive (then the B4539) in Watford, but this change was never implemented. Route now unclassified.
A4164			Ran from the A4093 at Hendreforgan to the B4564 near Gilfach Goch. Now an extension of the B4564.
A4165	Oxford	Kidlington	Banbury Road
A4166			Ran from the A38 to the A456 in Birmingham. Originally numbered B4129.
A4167	Highgate	Sparkbrook	Connects A41 to A4540/A435.
A4168	Woodsetton	Dudley	Originally ran between West Bromwich and Smethwick; initially numbered as B4168 and was the A4031 briefly in the late 1970s before becoming the A4168. However the real A4168 is in Dudley, making this use a duplicate. In 2004 the route was correctly renumbered to A4252, although some signs on the roundabout and approaches still showed A4168 as of December 2017.
A4169	Shifnal	Much Wenlock	The section immediately south of Shifnal was turnpiked in 1763 as one of a number of roads from Stafford and Newport, but leaves this turning sharply westwards, along a road formerly part of the Madeley turnpikes. It ends when reaches the present A442 road, but resumes a short distance further north, becoming a southern bypass for Telford. It then crosses Buildwas Bridge and runs to Much Wenlock.
A4170			Ran from Coventry City Centre to Keresley Green Road, originally part of the A423 until 1973. Downgraded to a portion of the B4098 in the late 1980s.
A4171	Cainscross	Badbrook
A4172	Preston Cross	Trumpet
A4173	Stroud	Gloucester
A4174	Filton	Bedminster Down, Bristol	The Bristol or Avon Ring Road
A4175	A4 / A4174 at Hicks Gate	Staple Hill	In two parts: Hick's Gate to A420 at Bridgeyate via Keynsham, and A4174 at Siston to Staple Hill
A4176	A4 at Hotwells	A4018 at Blackboy Hill	Bridge Valley Road and Upper Belgrave Road, Bristol
A4177	Meer End	Warwick	Section south of Five Ways previously part of A41; section renumbered when an extension of the M40 motorway opened.
A4178	Oxhey	Watford
A4179			Ran along Wembley Hill Road, Empire Way and Bridge Road in Wembley; originally part of the B4565 and A4089. The section along Bridge Road returned to the A4089 while the remainder became the A479 (possibly a typo) when the new Wembley Stadium opened in 2007.
A4180	Yeading	Northwood	Starts at the White Hart Roundabout in Yeading at a junction with the A312. The section between this roundabout and the Polish War Memorial used to be the B455 but was "double-upgraded" to primary route status when the A312 Parkway bypass was built during the mid-1990s. Then becomes West End Road, High Street (Ruislip), Bury Street and Ducks Hill Road heading north towards the A404 Rickmansworth Road.
A4181			Not shown on maps; only appears in the 2005 DfT Road List as running along Roebuck Lane in West Bromwich, formerly B4168. If the number was used, it was probably for a short time in the late 1960s as the route was split by the M5 in the early 1970s. The nearby A4252 now serves A4181's function.
A4182	West Bromwich	West Bromwich
A4183	Abingdon	Lodge Hill	Oxford Road, Abingdon. This road was formerly part of the A34. The remaining part of the road between Lodge Hill and Hinksey Hill near Oxford has since been unclassified.
A4184	Evesham	Evesham
A4185	Rowstock	Chilton	This road was formerly part of the A34.
A4186 - A4188	Unused
A4189	Redditch	Warwick
A4190 - A4192	Unused
A4193	A465 in Hereford	A438 in Hereford	Commercial Road; unsigned.
A4194	Reserved		Reserved for the Hereford Southern Link Road from the A49/B4399 junction to the A465/B4349 junction. Modern maps erroneously show the number applying to the City Link Road, this is actually part of the A465.
A4195	Unused
A4196	West Bromwich	Wednesbury	Formerly part of A41.
A4197	Unused
A4198	Swindon	Swindon	Thamesdown Drive
A4199	Unused

Four-digit roads (42xx and higher)

Road	From	To	Notes
A4200	Central London (Aldwych)	Mornington Crescent, Camden
A4201	Central London (Piccadilly Circus)	Regent's Park
A4202	Hyde Park Corner	Marble Arch	Part of the London Inner Ring Road
A4203	Unused		Cut the corner between the A4 and A4202 in Hamilton Place. Became a portion of the A4202 by the 1940s; route is now unclassified due to dualling and realignment of Park Lane in the 1960s.
A4204	Kensington	Notting Hill Gate	Kensington Church Street
A4205	Edgware Road station	Bishops Bridge, Paddington
A4206	Notting Hill Gate	Paddington Basin
A4207	Westbourne Grove	Westbourne Park
A4208	Ludgate Circus	Holborn Circus	St Bride Street is closed off to traffic (except pushbikes) and Stonecutter Street is exit only.
A4209	Edgware Road station	Lancaster Gate
A4210	Unused
A4211			Old route of A48 after the A48(M) Port Talbot Bypass was opened in the mid-1960s. Became the A48 again when the A48(M) was renumbered to M4 in the mid-1970s.
A4212	Bala	Trawsfynydd
A4213			Ran across northern Carmarthen. Upgraded from the B4207 in the late 1960s, but was downgraded to the B4312 after the Carmarthen bypass was built.
A4214	Llanelli	Hendy
A4215	Libanus	Defynnog
A4216	Sketty	Gendros
A4217	Swansea	Llansamlet
A4218	Tenby	Tenby
A4219	Scleddau	Manorowen
A4220	Unused
A4221	Banwen	Abercraf
A4222	Cowbridge	Talbot Green
A4223	A4058 in Pontypridd	A470 in Pontypridd
A4224			Ran from Abercynon to Aberdare. Formerly a portion of the A4059; downgraded to a section of the B4275 around 1990.
A4225			Ran from Porth to Trehafod, was the A4058. Downgraded to a portion of the B4278, but although there is evidence the A4225 number may still exist, it may be no more than a mapping error, as the current reference to it is on Google Earth.
A4226	Bonvilston	Cardiff Airport
A4227	Unused
A4228			Described as a road in Pontypridd, but this is a typo for the A4223.
A4229	Pyle	Porthcawl
A4230	Llansamlet	Aberdulais
A4231	Biglis	Pencoedtre
A4232	M4 J30 Cardiff East	M4 J33 Cardiff West	Cardiff Link Road (Peripheral Distribution Road)
A4233	Tonyrefail	Aberdare
A4234	Adam Street, Cardiff	Queensgate Roundabout, Cardiff	Central Link Road of the Peripheral Distribution Road
A4235 - A4239	Unused
A4240	Penllergaer	Loughor
A4241	Port Talbot	Baglan	Port Talbot southern distributor road
A4242	Carmarthen	Carmarthen
A4243	Carmarthen	Carmarthen
A4244	Brynrefail	Glasinfryn	Reclassified from parts of B4366 and B4547
A4245 - A4250	Unused
A4251	Kings Langley	Near Tring	Largely the old route of the A41
A4252	West Bromwich	Smethwick	Part of the route was originally numbered B4168, A4168 and A4031. Renumbered A4252 in 2004 although as late as 2017 some signs showed A4168.
A4253	Unused
A4254	Chilvers Coton	Horeston Grange	Nuneaton Eastern Relief Road
A4255	Unused
A4256	Drayton	Daventry Reservoir
A4257 - A4258	Unused
A4259	Swindon	Wanborough
A4260	Banbury	near Pear Tree, Oxford
A4261 - A4272	Unused
A4273			Listed as "Local Link in Coventry". Route is unknown.
A4274 - A4279	Unused
A4280	Bedford A428	Bedford A421	Largely the old route of the A428
A4281	A4046 in Victoria, Ebbw Vale	Ebbw Vale East and Ebbw Vale West junctions	One section was formerly a portion of the A465.
A4282 - A4288	Unused
A4289	Swindon	Swindon
A4290 - A4299	Unused
A4300	Kettering	Kettering
A4301	Gloucester	Gloucester
A4302	Gloucester	Gloucester
A4303	A5 near Cross in Hand	M1 J20	Lutterworth southern bypass; serves Magna Park distribution centre; dualled for entire length. Former portion of the A427.
A4304	M1 J20	Market Harborough
A4305 - A4310	Unused
A4311	Swindon	Swindon
A4312	Swindon	Swindon
A4313	Swindon	Walcot
A4314 - A4319	Unused
A4320	Arno's Vale	M32 J3
A4321 - A4360	Unused
A4361	Beckhampton	Swindon	Renumbered from the A361 in the 1970s, with an extra digit to encourage traffic to avoid Swindon.
A4362 - A4379	Unused
A4380	A41 Park Road	Oxford Street	Designated in 2018, when Baker Street and Gloucester Place became two-way roads.
A4381 - A4389	Unused
A4390	A3400 Birmingham Road, Stratford-upon-Avon	A422 Banbury Road, Bridge Town	Former A4134 (and B4534 before that).
A4391 - A4399	Unused
A4400	Lancaster Circus, Birmingham	Paradise Circus, Birmingham	Formerly used for the entire Birmingham Inner Ring Road, this is the designation for the ground level road where the A38 runs through tunnels. The western section is now the A38, the eastern section now B4100 and the remainder demolished.
A4401 - A4419	Unused
A4420	Hoobrook	Birchen Coppice	Silverwood Way
A4421	Bicester	Finmere
A4422 - A4439	Unused
A4440	Worcester	Worcester
A4441 - A4443	Unused
A4444	Bilston	Moxley	Black Country New Road. Connects A463 and A41. Runs parallel to Walsall Canal.
A4445 - A4499	Unused
A4500	Northampton	Wellingborough	Formerly A45. Runs from M1 junction 16 to A509 Wellingborough ring road
A4501	Northampton	Northampton
A4502 - A4507	Unused
A4508	Unused		Ran from A45 south of Billing to Kingsthorpe (numbered as a link between A45 and A508). Renumbered to A5076 in the 2000s because the road was in zone 5.
A4509	Unused
A4510	M54	i54 Business Park	Eastbound access to M54 or westbound access to i54 uses adjacent J2 (A449) slip roads.
A4511 - A4531	Unused
A4532			Ran from Malvern Link to Great Malvern; created in the 1960s when the A440 was decommissioned. The A4532 took over the westernmost section of the ex-A440 as well as the northernmost section of the B4208. Half of Pickersleigh Road returned to the B4208 (the other half is unclassified) and the remainder (the former A440) is now the B4211.
A4533 - A4534	Unused
A4535	Kidderminster	Kidderminster
A4536	Fernhill Heath	A38
A4537	Unused
A4538	Spetchley	Martin Hussingtree	Originally Evesham to Martin Hussingtree; former B4084. The route between Spetchley and Evesham became a portion of the A44 in 2004.
A4539			Appears on OS Landranger maps running from the A442 to the Priorslee Roundabout at the then-A5, A464 and B5061 via the old M54 J5. The section between the A442 and M54 may have had the A4539 number with the remainder up to the A464 as part of the A5 (this is possible because the number on the map is as long as the section mentioned), but no further maps showing the number have been found.
A4540	Birmingham Ring Road		The Middleway. The name stems from the road originally being designated as the Middle Ring Road. It is now the only one of Birmingham's Ring Road to be completely dual carriageway.
A4541			Ran from Meole Brace to The Column, forming the start of the Shrewsbury eastern bypass. Renumbered to the A5112 except for a small section at the northern end that is now part of the A458. Whether or not the road was out-of-zone is debatable: while the road was on the wrong side of the A5 Shrewsbury bypass, it was on the correct side of the original A5.
A4542 - A4544	Unused
A4545	M42 J5A	Clock Interchange	Planned; number chosen "because of its significance linking it with the A45 Clock Interchange which is part of the network already used by motorists"
A4546 - A4599	Unused
A4600	M69 J2	Coventry	Formerly part of the A46.
A4601	Cannock	Cannock	Former route of A460.
A4640	M54 J4	A518	Former B5060, renumbered in 2008.
A4723			Shown in a 1975 AA Touring Guide town plan for Birmingham on Harborne Lane in Selly Oak as headed for the "Ring Road (A4723)". As Harborne Lane is part of the A4040 (Birmingham Ring Road), the "A4723" is probably a typo for the A4123.
A4801			Ran from Piccadilly Circus to Charing Cross Road in London via Coventry Street (may be a typo for A4201, but could be genuine).
A4810	Newport SDR	M4 J23A	Classified A4810 in September 2013 when opened to the public
A4811	Glendulais	Glen-Hafren	Former routing of A483 and A489 though Newtown. Designated in February 2019 when the Newtown bypass opened.
A4971	Minffordd, Gwynedd	Porthmadog	Designated October 2011; formerly part of the A487.

References

1. Mosalski, Ruth (4 November 2014). "The A44 between Llangurig and Aberystwyth is revealed as Wales' most dangerous road". walesonline. Retrieved 12 August 2019.