A roads in Zone 4 of the Great Britain numbering scheme
The numbering zones for A-roads in Great Britain
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).
Single- and double-digit roads
| Road | From | To | Notes |
|---|---|---|---|
 A4 road |
City of London (Holborn Circus) | Avonmouth | Originally London to Bath |
 A40 road |
City of London (near St. Paul's Cathedral) | Fishguard | The longest A road in Zone 4 at 256 miles long |
 A41 road |
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. |
 A42 road |
Kegworth | Appleby Magna | A continuation of the M42, hence the use of A42 despite being entirely in Zone 5. Early road atlases show the A42 running along the present A4074 and A34 from Reading to Birmingham. |
 A43 road |
M40 motorway Junction 10 north of Bicester | Stamford | |
 A44 road |
Oxford | Aberystwyth | Officially the most dangerous road in Wales between Aberystwyth and Llangurig. Between Evesham and J6, M5, originally A4538. |
 A45 road |
Birmingham | Thrapston | Previously continued along route of current A14 to Felixstowe |
 A46 road |
Bath | Cleethorpes | Most of the section betweens Evesham and Leicester replaced by new-build sections, as well as the M69 motorway between Coventry and Leicester. 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 Toddington also became part of the A46, and the current section of the A46 round Stratford was new build. |
 A47 road |
Leicester | Great Yarmouth | The section between Birmingham and Nuneaton has 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. |
 A48 road |
Highnam near Gloucester | Carmarthen | Originally began in Worcester. Worcester to Newport is now A449. |
 A49 road |
Ross-on-Wye | Bamber Bridge |
Triple-digit roads
Four-digit roads (40xx)
Four-digit roads (41xx)
| Road | From | To | Notes |
|---|---|---|---|
 A4100 road |
Blackheath | Brierley Hill | |
 A4101 road |
Kingswinford | Dudley | |
 A4102 road |
Amblecote | Duplicate number | |
| A4102 road |
Merthyr Tydfil | Merthyr Tydfil | |
 A4103 road |
Worcester | Hereford | |
 A4104 road |
Little Malvern | Pershore | |
 A4106 road |
Bridgend | Porthcawl | |
 A4107 road |
Bwlch y Clawdd | Port Talbot | |
 A4109 road |
Aberdulais | Glynneath | |
 A4110 road |
Leintwardine | Hereford | |
 A4111 road |
Willersley | Kington | |
 A4112 road |
Tenbury Wells | Eardisley | |
 A4113 road |
Bromfield | Knighton | |
 A4114 road |
Allesley | Willenhall | |
 A4115 road |
Templeton | Cross Hands | |
 A4117 road |
Near Bewdley | Ludlow | Passes Titterstone Clee Hill at 381 metres above sea level. |
 A4118 road |
Dyfatty Street, Swansea | Port Eynon | |
 A4119 road |
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 road |
Llanbadarn Fawr, Aberystwyth | Ponterwyd | It runs parallel with the A44, but on the other side of the Rheidol Valley. |
 A4123 road |
Wolverhampton | Harborne (Birmingham) | |
 A4124 road |
Wolverhampton | Brownhills | |
 A4125 road |
Northwood | Bushey | |
 A4126 road |
Monmore Green | Coseley | |
 A4127 road |
Heston | Wembley | |
 A4128 road |
High Wycombe | Great Missenden | |
 A4129 road |
Princes Risborough | Thame | |
 A4130 road |
Burchetts Green | Rowstock | The section of road between Milton Hill and Rowstock was formerly part of the A34. |
 A4133 road |
Great Witley | Droitwich Spa | |
 A4135 road |
Tetbury | Slimbridge | |
 A4136 road |
Huntley, Gloucestershire | Monmouth | Both ends link to A40 - goes through Forest of Dean |
 A4137 road |
Marston | St Owen's Cross | |
 A4138 road |
Pontardulais | Llanelli | |
 A4139 road |
Tenby | Pembroke Dock | |
 A4140 road |
Wembley | Bushey Heath | Salmon Street, Fryent Way, Honeypot Lane, Marsh Lane. North of Stanmore Broadway as Stanmore Hill and The Common. |
 A4141 road |
Solihull | Five Ways | |
 A4142 road |
Heyford Hill, Oxford | Headington | Part of the Oxford Ring Road |
 A4143 road |
Llanfoist | Abergavenny | |
 A4144 road |
Pear Tree, Oxford | Redbridge Park and Ride | |
 A4145 road |
Watford | Rickmansworth | |
 A4146 road |
Milton Keynes | Hemel Hempstead | |
 A4147 road |
Hemel Hempstead | St Albans | |
 A4148 road |
Bescot | Bescot | Walsall Ring Road |
 A4150 road |
Wolverhampton Ring Road | ||
 A4151 road |
A49 at Elton, Gloucestershire | A4136 at Nailbridge | Through the Forest of Dean, main town on this road is Cinderford |
 A4154 road |
Amersham | Amersham on the Hill | |
 A4155 road |
Bourne End | Reading | By way of Little Marlow, Marlow, Medmenham, Henley-on-Thames, Lower Shiplake and Caversham |
 A4156 road |
Aylesbury | Aylesbury | Part of Oxford Road, connects A413 and A418. |
 A4157 road |
Aylesbury | Quarrendon | Aylesbury outer ring road |
 A4158 road |
Oxford | Iffley | |
 A4159 road |
Bow Street, Aberystwyth | A44 | Acts as a by-pass around the northern part of Aberystwyth. |
 A4160 road |
Newport Road, Cardiff | Llandough | |
 A4161 road |
Ely Bridge, Cardiff | Southern Way, Cardiff | Runs along a part of the old A48 |
 A4162 road |
Sea Mills | Westbury-on-Trym | |
 A4165 road |
Oxford | Kidlington | Banbury Road |
 A4167 road |
Birmingham | A456 | |
 A4168 road |
Woodsetton | Dudley | |
 A4169 road |
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. |
 A4171 road |
Cainscross | Badbrook | |
 A4172 road |
Preston Cross | Trumpet | |
 A4173 road |
Stroud | Gloucester | |
 A4174 road |
Filton | Bedminster Down, Bristol | The Bristol Ring Road |
 A4175 road |
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 road |
A4 at Hotwells | A4018 at Blackboy Hill | Bridge Valley Road and Upper Belgrave Road, Bristol |
 A4177 road |
Meer End | Warwick | |
 A4178 road |
Oxhey | Watford | |
 A4180 road |
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. |
 A4182 road |
West Bromwich | West Bromwich | |
 A4183 road |
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 road |
Evesham | Evesham | |
 A4185 road |
Rowstock | Chilton | This road was formerly part of the A34. |
 A4189 road |
Redditch | Warwick | |
 A4196 road |
West Bromwich | Wednesbury |
Four-digit roads (42xx and higher)
 |
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