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 spur (Heathrow) southbound between M4 and J4A | Westbound | Congestion
Sun, 20 Aug 2017 07:49:23 GMT
M4 Current Traffic Incidents
Location : The M4 westbound between junctions J4 and J4A . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 08:45 and 09:00 on 20 August 2017. Delay : There are currently delays of 10 minutes against expected traffic.

connector at M4 J4/M4 spur (Heathrow) | Eastbound | Congestion
Sun, 20 Aug 2017 06:52:30 GMT
M4 Current Traffic Incidents
Location : The M4 eastbound exit slip at junction J4 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 07:45 and 08:00 on 20 August 2017.

M4 spur (Heathrow) southbound between M4 and J4A | Westbound | Road Works
Sun, 20 Aug 2017 00:18:02 GMT
M4 Roadworks
Location : The M4 westbound between junctions J4 and J4A . Lane Closures : Lane three will be closed. Reason : Emergency barrier repairs are planned. Status : Pending. Schedule : From 22:00 on 26 August 2017 to 05:00 on 27 August 2017. Lanes Closed : There will be one of three lanes closed.

M4 J18 westbound exit | Westbound | Congestion
Sat, 19 Aug 2017 20:48:30 GMT
M4 Current Traffic Incidents
Location : The M4 westbound exit slip at junction J18 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 21:45 and 22:00 on 19 August 2017. Delay : There are currently delays of 10 minutes against expected traffic.

M4 westbound within J1 | Westbound | Congestion
Sat, 19 Aug 2017 17:17:30 GMT
M4 Current Traffic Incidents
Location : The M4 westbound between junctions J1 and J2 . Reason : Congestion. Status : Currently Active. Return To Normal : Normal traffic conditions are expected between 18:15 and 18:30 on 19 August 2017. Delay : There are currently delays of 10 minutes against expected traffic.

Map of M4 Motorway Junctions

West M4

East M4

How Do I Find M4 Traffic News?

Latest M4 News