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Exit List

All the junctions and destinations along the route.

The 50mph limit shown here on the Newport Bypass between junctions 24 and 28 is temporary, and will be replaced with a Variable Speed Limit system in 2010.

Junction		Eastbound								Westbound
1 12.4 km		Central London Hammersmith A4		A315 A406		EAST A4		A205		N/A
		1 mile, 2 lanes								1 mile, 2 lanes
2 13.4 km		North Circular Road A406 South Circular Road A205 Chiswick A315						A4		Staines Hounslow A4
		2 miles, 2 lanes								2 miles, 2 lanes
16.0 km
		3 miles, 2+1 lanes								3 miles, 3 lanes
20.5 km		Heston								Heston
		1 mile, 2+1 lanes								2 miles, 3 lanes
3 22.0 km		Feltham A312 Hounslow (A3006)		A312				A312		Heathrow T4 & Cargo Feltham Hayes A312
		2 miles, 3 lanes								2 miles, 3 lanes
4 25.0 km		Uxbridge Hayes Heathrow T1, 2 & 3 (A408)		(A408)				(A4)		Heathrow T1, 2 & 3 Uxbridge (A408)
		2 miles, 4 lanes								2 miles, 4 lanes
4B		Watford (M1 ) Birmingham (M40 ) Heathrow T4 & Cargo Gatwick (M23 ) Winchester (M3 ) M25		M25 (M1) (M40)				M25 (M3) (M23)		Heathrow T4 & Cargo Gatwick (M23 ) Watford (M1 ) Birmingham (M40 ) M25
		2 miles, 4 lanes								2 miles, 4 lanes
5		Langley B470 Staines (A3044) A4		A4				A4 (A3044) B470		Langley A4 Eton B470
		4 miles, 3 lanes								4 miles, 3 lanes
6		Slough (C) A335 Windsor (A332)		A335				A335		Slough (C) A335 Windsor (A332)
		2 miles, 3 lanes								2 miles, 3 lanes
7		Slough (W) A4		(A4)						Slough (W) A4
		4 miles, 3 lanes
		Thames								Thames
										4 miles, 3 lanes
8/9		High Wycombe A404(M) Maidenhead A308(M)		A308(M) A404(M)						High Wycombe Henley A404(M) Maidenhead A308(M)
		7 miles, 3 lanes								7 miles, 3 lanes
10		Reading (E) Wokingham Bracknell A329(M)		A329(M)				A329(M)		Reading (E) Wokingham Bracknell A329(M)
		6 miles, 3 lanes								6 miles, 3 lanes
11		Reading (C & S) Basingstoke A33		B3270 A33				A33		Reading (C & S) Basingstoke A33
		3 miles, 3 lanes								3 miles, 3 lanes
		Reading								Reading
		2 miles, 3 lanes								2 miles, 3 lanes
12		Theale Reading (W) A4		A4				A4		Theale Reading (W) A4
		12 miles, 3 lanes								12 miles, 3 lanes
13		Newbury Oxford A34 Chieveley		A34				A34		Newbury Oxford A34 Chieveley
		8 miles, 3 lanes								8 miles, 3 lanes
14		Hungerford Wantage A338		A338				A338		Hungerford Wantage A338
		4 miles, 3 lanes								4 miles, 3 lanes
		Membury								Membury
		8 miles, 3 lanes								8 miles, 3 lanes
15		Marlborough A346 Swindon (E) A419 Oxford (A420)		A419 (A420)				A346		Marlborough A346 Swindon A419
		6 miles, 3 lanes								6 miles, 3 lanes
16		Swindon (W) Wootton Bassett RAF Lyneham Calne A3102		A3102				B4005 A3102		Swindon (W) Wootton Bassett RAF Lyneham Calne A3102
		12 miles, 3 lanes								12 miles, 3 lanes
17		Cirencester A429 Chippenham A350		A429				B4122 A350		Cirencester A429 Chippenham A350
		2 miles, 3 lanes								2 miles, 3 lanes
		Leigh Delamere								Leigh Delamere
		9 miles, 3 lanes								9 miles, 3 lanes
18		Bath Stroud A46		A46				A46		Bath Stroud A46
		7 miles, 3 lanes								7 miles, 3 lanes
19		Bristol M32						M32		Bristol M32
		3 miles, 3 lanes								3 miles, 3 lanes
20		The MIDLANDS Gloucester The SOUTH WEST Bristol & M5		M5				M5		The SOUTH WEST Bristol (W) The MIDLANDS Gloucester M5
		2 miles, 3 lanes								2 miles, 2 lanes
21				M48						Chepstow M48
		3 miles, 2 lanes								3 miles, 2 lanes
22		The SOUTH WEST Avonmouth M49 (M5 )						M49		Avonmouth M49
		7 miles, 3 lanes
		Severn								Severn
										6 miles, 3 lanes
										Severn Bridge Toll
23		Chepstow M48		M48
		1 mile, 3 lanes								2 miles, 3 lanes
23A		Magor B4245 Magor						B4245		Magor Caldicot B4245 Magor
		4 miles, 3 lanes								4 miles, 3 lanes
24		The MIDLANDS Monmouth A449 (M50 ) Newport A48		A48 A449				A48 B4237		Newport (E) A48 Monmouth A449
		4.25 miles, 3 lanes								3 miles, 3 lanes
25				B4596				B4596		Caerleon B4596
										0.25 miles, 3 lanes
25A				A4042				A4042		Newport Cwmbran A4042
		1 mile, 2 lanes
		Brynglas Tunnel								Brynglas Tunnel
										1 mile, 2 lanes
26		Cwmbran Newport Caerleon A4051		A4051				A4051		Newport A4051
		2 miles, 3 lanes								2 miles, 3 lanes
27		High Cross B4591		B4591				B4591		High Cross B4591
		1 mile, 3 lanes								1 mile, 3 lanes
28		Newport A48 Risca Brynmawr A467		A467				A48 A48		Newport A48 Risca Brynmawr A467
		5 miles, 3 lanes								2 miles, 3 lanes
29								A48(M)		Cardiff (E & S) A48(M)
										3 miles, 3 lanes
30		Cardiff (E) A4232 Cardiff Gate						A4232		Cardiff (E) A4232 Cardiff Gate
		5 miles, 3 lanes								5 miles, 3 lanes
32		Cardiff Merthyr Tydfil A470		A4054 A470				A470 A4054		Cardiff Merthyr Tydfil A470
		3 miles, 3 lanes								3 miles, 3 lanes
33		Cardiff (W) & Barry Penarth A4232 Cardiff West						A4232		Cardiff (W) & Barry Penarth A4232 Cardiff West
		2 miles, 4 lanes								2 miles, 3 lanes
34		Llantrisant Rhondda A4119		A4119						Llantrisant Rhondda A4119
		6 miles, 3 lanes								6 miles, 3 lanes
35		Bridgend Pen-coed A473		A473				A473		Bridgend Pen-coed A473
		4 miles, 3 lanes								4 miles, 3 lanes
36		Bridgend A4061 Maesteg A4063 Sarn Park		A4061 A4063				A4061		Bridgend A4061 Maesteg A4063 Sarn Park
		6 miles, 3 lanes								6 miles, 3 lanes
37		Pyle Porthcawl A4229		A4229 (A48)				A4229		Pyle Porthcawl A4229
		3 miles, 3 lanes								3 miles, 3 lanes
38		Port Talbot A48		A48						Port Talbot A48
		4 miles, 2 lanes
39								A48
										4 miles, 2 lanes
40		Port Talbot A4107		A4107				A4107		Port Talbot A4107
		1 mile, 2 lanes
41		Port Talbot A48		A48				B4286 A48
		1 mile, 2 lanes								2 miles, 2 lanes
41				(A48)						Briton Ferry A48
		3 miles, 2 lanes
		Neath								Neath
										3 miles, 2 lanes
42				A483				A483		Swansea A483
42		Briton Ferry A48 Swansea A483		(A48) (A483)
		2 miles, 3 lanes								2 miles, 3 lanes
43		Neath Merthyr Tydfil A465		A465				B4290		Neath Merthyr Tydfil A465
		2 miles, 2 lanes								2 miles, 2 lanes
44		Swansea (E) A48		A4230 B4291				A48		Swansea (E) A48
		2 miles, 2 lanes								2 miles, 2 lanes
45		Swansea Pontardawe A4067		A4067 B4603				A4067 B4603		Swansea Pontardawe A4067
		2 miles, 2 lanes								2 miles, 2 lanes
46		Llangyfelach Felindre B4489						A48 B4489 A48		Llangyfelach Felindre B4489
		2 miles, 2 lanes								2 miles, 2 lanes
47		Swansea (W) A483 Swansea						A48 A483 A48		Swansea (W) A483 Swansea
		4 miles, 2 lanes
		Loughor								Loughor
										4 miles, 2 lanes
48		Pontarddulais Llanelli A4138		A4138				A4138		Pontarddulais Llanelli A4138
		3 miles, 2 lanes								3 miles, 2 lanes
49		N/A		A48 A483		A48 WEST				Pont Abraham Carmarthen A48 Llandeilo A483

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