Map of M4 Motorway Junctions

Map of the M4 motorway junctions.

West M4

To the West the M4 joins the M5 at M4 Junction 20 which heads north to Devon Cornwall and the South West of England.

The Western end of the M4 is in South Wales Junctions 23 to 48. Bridgend is on Junctions 25 to 37, M4 Junctions 44 and 45 for Swansea, Junctions 30 to 33 for Cardiff and Junctions 24 to 28 for Newport.

East M4

At the eastern end of the M4 is London, with Junctions for Slough, Reading, Newbury, Swindon and Bristol on the way to Wales in the West.

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M4 eastbound between J4 and J3 | Eastbound | Roadworks
Fri, 25 Jul 2014 02:30:35 BST
M4 Roadworks
On the M4 eastbound between junctions J4 and J2, minor delays are possible due to roadworks closing one lane. Expect disruption until 5:00 am on 2 August 2014.

M4 J3 westbound access | Westbound | Roadworks
Fri, 25 Jul 2014 02:28:41 BST
M4 Roadworks
On the M4 westbound entry slip at junction J3 , minor delays are possible due to roadworks closing one lane. Expect disruption until 5:00 am on 2 August 2014.

M4 westbound between J13 and J14 | Westbound | Roadworks
Fri, 1 Aug 2014 02:54:12 BST
M4 Roadworks
On the M4 westbound between junctions J13 and J14, minor delays are possible due to roadworks closing one lane. Expect disruption until 5:30 am on 2 August 2014.

M4 westbound between J12 and J13 | Westbound | Roadworks
Wed, 30 Jul 2014 03:41:05 BST
M4 Roadworks
On the M4 westbound between junctions J12 and J13, expect delays of up to 10 mins at peak times due to roadworks closing three lanes, between 10 pm and 6 am, from 6 August 2014 to 9 August 2014.

M4 westbound between J4B and J5 | Westbound | Roadworks
Wed, 30 Jul 2014 02:21:35 BST
M4 Roadworks
On the M4 westbound between junctions J4B and J6, expect delays of up to 10 mins at peak times due to roadworks closing two lanes, from 10 pm on 6 August 2014 to 5 am on 7 August 2014.

Map of M4 Motorway Junctions

West M4

East M4

How Do I Find M4 Traffic News?

Latest M4 News